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Document and Entity Information - shares	6 Months Ended
Document and Entity Information - shares	Jun. 30, 2017	Jul. 25, 2017
Document Documentand Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Trading Symbol	LDOS
Entity Registrant Name	Leidos Holdings, Inc.
Entity Central Index Key	0001336920
Current Fiscal Year End Date	--12-29
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		151,209,095

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 30, 2016
Current assets:
Cash and cash equivalents	$ 262	$ 376
Receivables, net	1,832	1,657
Inventory, prepaid expenses and other current assets	340	348
Total current assets	2,434	2,381
Property, plant and equipment, net	215	259
Intangible assets, net	1,006	1,589
Goodwill	4,922	4,622
Deferred tax assets	13	16
Other assets	292	265
Total assets	8,882	9,132
Current liabilities:
Accounts payable and accrued liabilities	1,330	1,427
Accrued payroll and employee benefits	475	483
Dividends payable	17	23
Income taxes payable	4	21
Long-term debt, current portion	84	62
Total current liabilities	1,910	2,016
Long-term debt, net of current portion	3,147	3,225
Deferred tax liabilities	362	540
Other long-term liabilities	222	204
Stockholders’ equity:
Common stock, $.0001 par value, 500 million shares authorized, 151 million and 150 million shares issued and outstanding at June 30, 2017 and December 30, 2016, respectively	0	0
Additional paid-in capital	3,321	3,316
Accumulated deficit	(105)	(177)
Accumulated other comprehensive income (loss)	8	(4)
Total Leidos stockholders’ equity	3,224	3,135
Non-controlling interest	17	12
Total equity	3,241	3,147
Total liabilities and stockholders' equity	$ 8,882	$ 9,132

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Jun. 30, 2017	Dec. 30, 2016
Statement of Financial Position [Abstract]
Common stock, par value per share (dollar per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	151,000,000	150,000,000
Common stock, shares outstanding	151,000,000	150,000,000

Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Income Statement [Abstract]
Revenues	$ 2,571	$ 1,288	$ 5,151	$ 2,600
Cost of revenues	2,233	1,141	4,503	2,295
Selling, general and administrative expenses	143	56	287	116
Acquisition and integration costs	16	15	35	24
Restructuring expenses	6	1	19	1
Equity losses of non-consolidated subsidiaries	7	0	0	0
Operating income	166	75	307	164
Interest income	2	2	4	5
Interest expense	(36)	(15)	(74)	(29)
Other income (expense), net	3	(2)	6	(2)
Income from continuing operations before income taxes	135	60	243	138
Income tax expense	(37)	(19)	(71)	(44)
Net income	98	41	172	94
Net Income (Loss) Attributable to Noncontrolling Interest	0	0	2	0
Net income attributable to Leidos common stockholders	$ 98	$ 41	$ 170	$ 94
Earnings per share:
Basic (dollar per share)	$ 0.65	$ 0.56	$ 1.13	$ 1.31
Diluted (dollar per share)	0.64	0.55	1.11	1.27
Cash dividends declared per share (dollars per share)	$ 0.32	$ 0.32	$ 0.64	$ 0.64

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 98	$ 41	$ 172	$ 94
Other comprehensive income, net of taxes:
Foreign currency translation adjustments	2	2	13	4
Unrecognized loss on derivative instruments	(2)	0	(1)	0
Total other comprehensive income, net of taxes	0	2	12	4
Comprehensive income	98	43	184	98
Less: comprehensive income attributable to non-controlling interest	0	0	2	0
Comprehensive income attributable to Leidos common stockholders	$ 98	$ 43	$ 182	$ 98

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016
Cash flows from operations:
Net income	$ 172	$ 94
Adjustments to reconcile net income to net cash provided by operations:
Depreciation and amortization	162	17
Stock-based compensation	20	16
Bad debt expense	12	0
Other	15	(3)
Change in assets and liabilities, net of effects of acquisitions and dispositions:
Receivables	(179)	(76)
Inventory, prepaid expenses and other current assets	35	(7)
Accounts payable and accrued liabilities	(123)	7
Accrued payroll and employee benefits	(7)	2
Deferred income taxes and income taxes receivable/payable	(44)	7
Other long-term assets/liabilities	26	1
Net cash provided by operating activities of continuing operations	89	58
Cash flows from investing activities:
Payments for property, plant and equipment	(23)	(7)
Collections on promissory note	2	0
Net proceeds from sale of assets	7	3
Proceeds from disposition of business	0	23
Other	0	(1)
Net cash (used in) provided by investing activities of continuing operations	(14)	18
Cash flows from financing activities:
Payments of long-term debt	(69)	(2)
Proceeds from issuances of stock	7	6
Repurchases of stock and other	(25)	(19)
Dividend payments	(102)	(46)
Net cash used in financing activities of continuing operations	(189)	(61)
Net (decrease) increase in cash and cash equivalents from continuing operations	(114)	15
Cash flows from discontinued operations:
Net cash used in investing activities of discontinued operations	0	(1)
Net decrease in cash and cash equivalents from discontinued operations	0	(1)
Net (decrease) increase in cash and cash equivalents	(114)	14
Cash and cash equivalents at beginning of period	376	656
Cash and cash equivalents at end of period	$ 262	$ 670

Basis of Presentation and Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2017

Accounting Policies [Abstract]

Basis of Presentation and Summary of Significant Accounting Policies

Nature of Operations and Basis of Presentation

Leidos Holdings, Inc. ("Leidos") is a holding company whose direct 100%-owned subsidiaries and principal operating companies are Leidos, Inc. and Leidos Innovations Corporation ("Leidos Innovations"). Leidos is a FORTUNE 500^® science and technology company that provides technology and engineering services and solutions in the defense, intelligence, civil and health markets. Leidos' domestic customers include the U.S. Department of Defense ("DoD"), the U.S. Intelligence Community, the U.S. Department of Homeland Security ("DHS"), the Federal Aviation Administration ("FAA"), the Department of Health and Human Services ("HHS"), U.S. Government civil agencies and state and local government agencies. Leidos' international customers include foreign governments and their agencies, primarily located in the United Kingdom, the Middle East and Australia. Unless indicated otherwise, references to the "Company," "we," "us" and "our" refer collectively to Leidos Holdings, Inc. and its consolidated subsidiaries.

The unaudited condensed consolidated financial statements of Leidos include the balances of its majority-owned and 100%-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation.

The accompanying unaudited condensed financial information has been prepared in accordance with the rules of the U.S. Securities and Exchange Commission ("SEC") and accounting principles generally accepted in the United States of America ("GAAP"). Certain disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingencies at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting periods. Management evaluates these estimates and assumptions on an ongoing basis, including those relating to estimated profitability of long-term contracts, indirect billing rates, allowances for doubtful accounts, inventories, fair value and impairment of intangible assets and goodwill, income taxes, stock-based compensation expense and contingencies. These estimates have been prepared by management on the basis of the most current and best available information; however, actual results could differ materially from those estimates.

In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments, which consist of normal recurring adjustments, necessary for a fair presentation thereof. The results reported in these unaudited condensed consolidated financial statements are not necessarily indicative of the results that may be expected for the entire year. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K filed on February 24, 2017.

During the quarter ended March 31, 2017, the Company completed its business reorganization, which resulted in identification of three reportable segments (Defense Solutions, Civil, Health) and corporate expenses. The Company commenced operating and reporting under the new organizational structure effective the beginning of fiscal 2017. As a result of this change, prior year segment results and disclosures have been recast to reflect the new reportable segments (see "Note 14–Business Segments").

Amounts in the prior year condensed consolidated statements of income that have been reclassified to conform to the current year presentation include, "Restructuring expenses," which were previously aggregated within "Selling, general and administrative expenses," and "Interest expense, net" which has been disaggregated into "Interest income" and "Interest expense."

Changes in Estimates on Contracts

Changes in estimates related to long-term contracts accounted for using the percentage of completion method of accounting are recognized in the period in which such changes are made for the inception-to-date effect of the changes, with the exception of contracts acquired through the acquisition of the IS&GS Business (see "Note 2–Acquisitions"), where the adjustment is made for the period commencing from the date of acquisition. Changes in these estimates can occur over the contract performance period for a variety of reasons, including changes in contract scope, contract cost estimates and estimated incentive or award fees.

Changes in estimates on contracts for the periods presented were as follows:



	Three Months Ended				Six Months Ended
	June 30, 2017		July 1, 2016		June 30, 2017		July 1, 2016
	(in millions, except per share amounts)
Net favorable impact to income from continuing operations before taxes	$	40	$	5	$	62	$	13
Impact on diluted EPS from continuing operations attributable to Leidos common stockholders	$	0.17	$	0.04	$	0.26	$	0.11

Accounting Standards Updates Adopted

In March 2016, the FASB issued ASU 2016-09 Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. The ASU requires that an entity, (i) recognize excess tax benefits and deficiencies related to employee share-based payment transactions as an income tax expense or benefit in the income statement rather than in equity; (ii) present the excess tax benefits as an operating activity on the statement of cash flows versus current guidance to present them as financing activities; and, (iii) elect to either recognize stock forfeitures as they occur or estimate them. During the quarter ended July 1, 2016, the Company elected to early adopt the provisions of the ASU prospectively from January 2, 2016, including continuation of estimating forfeitures instead of recording them as they occur. Consequently, the Company recognized a $3 million and $7 million discrete tax benefit for the quarter and six months ended July 1, 2016, respectively, and operating cash flows for the six months ended July 1, 2016, increased $7 million with a corresponding decrease to financing cash flows.

In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. This ASU eliminates Step 2 of the goodwill impairment test and simplifies how the amount of an impairment loss is determined. The update is effective for public companies in the beginning of fiscal year 2020 and shall be applied on a prospective basis. Early adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. The Company adopted the provisions of ASU 2017-04 prospectively in the first quarter of fiscal 2017 and the standard did not have a material effect on the Company's consolidated financial position, results of operations or cash flows.

In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting. This ASU provides clarification on when to apply modification accounting for a stock-based award to reduce diversity in practice. The update is effective for public companies in the beginning of fiscal year 2018 and shall be applied on a prospective basis. Early adoption is permitted for public business entities. The Company adopted the provisions of ASU 2017-09 prospectively in the second quarter of fiscal 2017 and the standard did not have a material effect on the Company's consolidated financial position, results of operations or cash flows.

Accounting Standards Updates Issued But Not Yet Adopted

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). This ASU affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of non-financial assets unless those contracts are within the scope of other standards (for example, insurance contracts or lease contracts). This ASU will supersede all revenue recognition requirements in Topic 605, Revenue Recognition, and industry-specific guidance throughout the Industry Topics of the codification. The guidance's core principle is that an entity should recognize revenue to depict the transfer of control for promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In applying the revenue principles, an entity will identify the contract(s) with a customer, identify the performance obligations, determine the transaction price, allocate the transaction price to the performance obligations and recognize revenue when the performance obligation is satisfied (i.e., either over time or point in time). The ASU further states that an entity should disclose sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The Company will adopt the new revenue standard in the beginning of fiscal 2018, under the modified retrospective method, where the cumulative effect is recognized at the date of initial adoption.

Based on the ongoing assessments, the Company believes the timing of and amount of revenue recognition will largely remain consistent between the current revenue standard and the revised revenue standard for the majority of the Company's contracts. Specifically, for time-and-materials, fixed-price-level-of-effort, cost-plus-award-fee, cost-plus-incentive fee and fixed-price-incentive fee contracts, the Company will continue to recognize revenue over time as work progresses because of the continuous transfer of control to the customer, generally using an input measure (e.g., cost incurred) to reflect progress. The Company tentatively expects that differences, if any, in revenue recognition between the current and revised revenue standards will primarily occur within the firm-fixed-price contracts as a result of the identification of new performance obligations. As of the end of the second quarter, the Company is still in the process of reviewing contracts and assessing the financial statement impact of the adoption of the new standard, if any.

Acquisitions

6 Months Ended

Jun. 30, 2017

Business Combinations [Abstract]

Acquisitions

On August 16, 2016, a wholly-owned subsidiary of Leidos Holdings, Inc. merged with the Information Systems & Global Solutions business (the "IS&GS Business") of Lockheed Martin Corporation in a Reverse Morris Trust transaction (the "Transactions"). The acquired IS&GS Business was renamed Leidos Innovations Corporation.

The preliminary purchase consideration for the acquisition of the IS&GS Business was as follows (in millions):



Value of common stock issued to Lockheed Martin stockholders⁽¹⁾	$	2,929
Equity consideration for replacement awards⁽²⁾	9
Preliminary working capital adjustments	55
Preliminary purchase price	$	2,993

⁽¹⁾ Represents approximately 77 million new shares of Leidos common stock issued to those Lockheed Martin stockholders who elected to participate in the exchange offer, based on the Company's August 16, 2016, closing share price of $51.69, less the Leidos special cash dividend amount of $13.64, which the Lockheed Martin stockholders were not entitled to receive.

⁽²⁾ The fair value of replacement equity-based awards attributable to pre-Merger service was recorded as part of the consideration transferred in the Merger.

The preliminary fair values of the assets acquired and liabilities assumed at the date of the Transactions were as follows (in millions):



Cash	$	25
Receivables	954
Inventory, prepaid expenses and other current assets	68
Property, plant and equipment	91
Deferred tax assets	8
Intangible assets	1,202
Other assets	57
Accounts payable and accrued liabilities	(713		)
Accrued payroll and employee benefits	(190		)
Long-term debt, current portion	(23		)
Deferred tax liabilities	(356		)
Long-term debt, net of current portion	(1,780		)
Other long-term liabilities	(52		)
Total identifiable net liabilities assumed	(709		)
Non-controlling interest	(13		)
Goodwill	3,715
Preliminary purchase price	$	2,993

Due to the timing and complexity of the Transactions, the Company recorded the assets acquired and liabilities assumed at their preliminary estimated fair values. As of June 30, 2017, the Company had not finalized the determination of fair values allocated to various assets and liabilities, including, but not limited to, receivables; property, plant and equipment; deferred income taxes; intangible assets; accounts payable and accrued liabilities; contractual contingencies; loss contracts; the residual amount allocated to goodwill; and the allocation of goodwill to reporting units. The preliminary purchase price allocation is subject to change as the Company completes its analysis of the provisional fair values of the acquired assets and liabilities assumed at the date of the Transactions.

During the quarter ended March 31, 2017, the Company recorded a purchase accounting adjustment to decrease goodwill by $3 million. During the quarter ended June 30, 2017, the Company recorded a purchase accounting adjustment to increase goodwill by $303 million related to changes to the preliminary estimated fair values of certain assets acquired and liabilities assumed. Significant changes included program intangibles, receivables, property, plant and equipment, other assets, accounts payable and accrued liabilities and deferred tax liabilities.

During the quarter ended June 30, 2017, the Company recognized a cumulative catch-up adjustment related to the valuation adjustments to intangible assets which resulted in a decrease in amortization expense of $8 million. This adjustment was offset by a $7 million increase in amortization expense as a result of the valuation adjustments to equity method investments. The Company recorded the cumulative catch-up adjustments in "Selling, general and administrative expenses" for the intangible assets and "Equity losses of non-consolidated subsidiaries" for the equity method investments in the Company's condensed consolidated statements of income.

During the quarter ended June 30, 2017, the Company recorded a valuation adjustment to fair value the non-controlling interest acquired. The fair value of $13 million was determined by calculating the present value of future cash flows for the non-controlling interest. Significant assumptions inherent in the valuation of the non-controlling interest include the estimated after-tax cash flows expected to be received and an assessment of the appropriate discount rate.

The goodwill represents intellectual capital and the acquired assembled work force, none of which qualify for recognition as a separate intangible asset. The preliminary value of goodwill has been allocated to the new reporting units on a relative fair value approach (see "Note 6–Goodwill"). Of the total goodwill, $414 million is tax deductible.

The Company identified $1.2 billion of intangible assets, representing programs and contract intangibles, backlog and software and technology. The fair value measurements were primarily based on significant inputs that are not observable in the market and represent a Level 3 measurement (see "Note 5–Fair Value Measurements"). The income approach was primarily used to value the intangible assets, consisting primarily of funded backlog and programs acquired. The income approach indicates value for an asset based on the present value of cash flow projected to be generated by the asset. Projected cash flow is discounted at a required rate of return that reflects the relative risk of achieving the cash flow and the time value of money.

The following table summarizes the preliminary fair value of intangible assets acquired at the date of acquisition and the related weighted average amortization period:



	Weighted average amortization period	Fair value
	(in years)	(in millions)
Programs and contract intangibles⁽¹⁾	9.0	$	997
Backlog	1.4	178
Software and technology	1.2	27
Total	7.8	$	1,202

⁽¹⁾ The weighted average amortization period is estimated based on the projected economic benefits associated with these assets. Refer to "Note 7–Intangible Assets" for additional information.

The Company incurred the following expenses related to the acquisition and integration of the IS&GS Business:



	Three Months Ended				Six Months Ended
	June 30, 2017		July 1, 2016		June 30, 2017		July 1, 2016
	(in millions)
Acquisition costs	$	—	$	7	$	1	$	13
Integration costs	16		8		34		11
Total acquisition and integration costs	$	16	$	15	$	35	$	24

Pro Forma Financial Information (unaudited)

The following pro forma financial information presents condensed consolidated results of operations as if the acquisition had occurred on January 3, 2015. The pro forma financial information was prepared based on historical financial information and has been adjusted to give effect to the events that are directly attributable to the Transactions and factually supportable. The unaudited pro forma results below do not reflect future events that have occurred or may occur after the Transactions, including anticipated synergies or other expected benefits that may be realized from the Transactions. The pro forma financial information is not intended to reflect the actual results of operations that would have occurred if the acquisition had been completed on January 3, 2015, nor is it intended to be an indication of future operating results.



	Three Months Ended		Six Months Ended
(unaudited)	July 1, 2016		July 1, 2016
	(in millions, except per share amounts)
Revenues	$	2,624	$	5,261
Income from continuing operations	103		150
Income from continuing operations attributable to Leidos common stockholders	102		147
Earnings per share:
Basic	$	0.68	$	0.99
Diluted	0.68		0.97

The unaudited pro forma financial information above excludes acquisition-related costs of $7 million and $13 million for the quarter and six months ended July 1, 2016, respectively, as a nonrecurring significant adjustment. This adjustment was made to account for certain costs incurred as if the Transactions had been completed on January 3, 2015.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

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+ Details

Divestitures	6 Months Ended
Divestitures	Jun. 30, 2017
Discontinued Operations and Disposal Groups [Abstract]
Divestitures	Divestitures In April 2016, the Company disposed of a business, historically included within the Civil segment, that was primarily focused on providing design, build and heavy construction engineering services. The Company received cash proceeds of $23 million, resulting in a preliminary pre-tax gain on sale of $3 million. The major classes of assets and liabilities sold included $73 million of accounts receivable, net; $3 million of non-current assets and $63 million of accounts payable and accrued liabilities. In addition, the Company recorded a $6 million liability in connection with issuance of a performance guarantee on a contract sold and guarantee of collection of the accounts receivable transferred. The Company paid $1 million of selling costs related to the transaction. The Company recorded the preliminary pre-tax gain on sale in "Other income (expense), net" in the Company's condensed consolidated statements of income during the quarter ended July 1, 2016. On July 24, 2015, the Company completed the sale of its equity interests in Plainfield Renewable Energy Holdings LLC ("Plainfield") for an aggregate consideration of $102 million, subject to certain adjustments and contingent earn-out payments. The consideration received by the Company at closing consisted of a cash payment of $29 million and a secured promissory note for $73 million, net of discount (the “Note”). The Note is payable semi-annually with a final lump sum due in July 2018. The Company collected $6 million of principal and interest during the quarter ended March 31, 2017. During the quarter ended June 30, 2017, Plainfield exercised the first of three one-year term extension options available under the original credit agreement, thereby extending the maturity date of the Note to July 24, 2018. Concurrent with this extension, the interest rate on the Note increased from 6% to 8%. Also, during the quarter ended June 30, 2017, Leidos and Plainfield entered into an amendment to the Note allowing Plainfield to defer up to $4 million of the interest and principal payments due in July 2017 and January 2018, until July 2018. In consideration of this deferment, Leidos received certain concessions and releases from obligations under the original transaction documents. As of June 30, 2017, the Company continues to expect the Note to be collectible in full.

- Definition

The entire disclosure related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

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+ Details

Restructuring Expenses

6 Months Ended

Jun. 30, 2017

Restructuring and Related Activities [Abstract]

Restructuring Expenses

After the acquisition of the IS&GS Business, the Company began an initiative to align its cost structure, which includes optimization of its real estate portfolio by vacating certain facilities and consolidating others, and by reducing headcount.

The restructuring expenses related to this program were as follows:



	Three Months Ended		Six Months Ended
	June 30, 2017		June 30, 2017
	(in millions)
Severance costs	$	2	$	12
Lease termination expenses	4		7
Restructuring expenses related to the IS&GS Business	$	6	$	19

These restructuring expenses have been recorded within corporate expenses and presented separately on the condensed consolidated statements of income.

The restructuring liability related to this program at June 30, 2017, was:



	Severance costs			Lease termination expenses			Total
	(in millions)
Balance as of December 30, 2016	$	7		$	1		$	8
Charges	12			7			19
Cash payments	(17		)	(6		)	(23		)
Balance as of June 30, 2017	$	2		$	2		$	4

The Company expects the remainder of the restructuring liability to be substantially settled within one year.

Fair Value Measurements

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

The accounting standard for fair value measurements establishes a three-level fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows: observable inputs such as quoted prices in active markets (Level 1); inputs other than quoted prices in active markets for identical assets or liabilities that are observable either directly or indirectly or quoted prices that are not active (Level 2); and unobservable inputs in which there is little or no market data (e.g., discounted cash flow and other similar pricing models), which requires the Company to develop its own assumptions (Level 3).

The accounting guidance for fair value measurements requires that the Company maximize the use of observable inputs and minimize the use of unobservable inputs in determining fair value. The accounting guidance provides for the irrevocable option to elect, on a contract-by-contract basis, to measure certain financial assets and liabilities at fair value at inception of the contract and record any subsequent changes in fair value in earnings. We have not made fair value option elections on any of our financial assets and liabilities.

The Company's assets measured on a recurring basis at fair value consisted of the following:



	June 30, 2017				December 30, 2016
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in millions)
Financial assets
Derivatives	$	30	$	30	$	29	$	29

The Company's derivatives consisted of the fair value interest rate swaps on its $450 million fixed rate 4.45% senior secured notes maturing in December 2020, and cash flow interest rate swaps on $1.2 billion of the Company's variable rate senior secured term loans (see "Note 9–Derivative Instruments"). The fair value of the fair value interest rate swaps and cash flow interest rate swaps is determined based on observed values for underlying interest rates on the LIBOR yield curve and the underlying interest rate, respectively (Level 2 inputs).

The carrying amounts of the Company’s financial instruments, other than derivatives, which include cash equivalents, accounts receivable, accounts payable and accrued expenses, are reasonable estimates of their related fair values. The carrying value of the Company's notes receivable as of June 30, 2017, of $91 million approximates fair value as the stated interest rates within the agreements are consistent with the current market rates used in notes with similar terms in the market (Level 2 inputs).

As of June 30, 2017, and December 30, 2016, the fair value of long-term debt was $3.3 billion for both periods and the carrying amount was $3.2 billion and $3.3 billion, respectively (see "Note 10–Debt"). The fair value of long-term debt is determined based on current interest rates available for debt with terms and maturities similar to the Company’s existing debt arrangements (Level 2 inputs).

The Company’s cash equivalents were primarily comprised of investments in several large institutional money market funds and bank deposits, with original maturity of three months or less.

At June 30, 2017, the Company did not have any assets or liabilities measured at fair value on a non-recurring basis, other than associated with purchase accounting (see "Note 2–Acquisitions").

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Goodwill

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

Goodwill, including the amounts from the acquisition of the IS&GS Business, was allocated to the new reporting units on a relative fair value approach. The amount of goodwill from the acquisition of the IS&GS Business has been valued on a preliminary basis and may change as purchase accounting is finalized (see "Note 2–Acquisitions").

The following table presents changes in the carrying amount of goodwill by reportable segment as of June 30, 2017 and December 30, 2016:



	Defense Solutions		Civil		Health		Total
	(in millions)
Goodwill at January 1, 2016	$	792	$	244	$	171	$	1,207
Acquisition of the IS&GS Business	1,162		1,487		766		3,415
Goodwill at December 30, 2016	1,954		1,731		937		4,622
Adjustment to original purchase price allocation	72		151		77		300
Goodwill at June 30, 2017	$	2,026	$	1,882	$	1,014	$	4,922

In conjunction with the change in reportable segments, the Company evaluated goodwill for impairment, both before and after the segment change and determined that goodwill was not impaired.

Goodwill is tested for impairment at the beginning of the fourth quarter and during interim periods whenever events or circumstances indicate that the carrying value may not be recoverable. There were no goodwill impairments during the six months ended June 30, 2017, and July 1, 2016.

Intangible Assets

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible assets, including the preliminary fair values of those acquired through the acquisition of the IS&GS Business, consisted of the following:



	June 30, 2017							December 30, 2016
	Gross carrying value		Accumulated amortization			Net carrying value		Gross carrying value		Accumulated amortization			Net carrying value
	(in millions)
Finite-lived intangible assets:
Programs and contract intangibles	$	997	$	(91	)	$	906	$	1,450	$	(25	)	$	1,425
Backlog	178		(113		)	65		200		(54		)	146
Software and technology	89		(59		)	30		61		(48		)	13
Customer relationships	6		(5		)	1		6		(5		)	1
Total finite-lived intangible assets	1,270		(268		)	1,002		1,717		(132		)	1,585
Indefinite-lived intangible assets:
Trade names	4		—			4		4		—			4
Total intangible assets	$	1,274	$	(268	)	$	1,006	$	1,721	$	(132	)	$	1,589

Amortization expense related to intangible assets, including those acquired through the Transactions, was $67 million and $136 million for the quarter and six months ended June 30, 2017, respectively, and $2 million and $3 million for the quarter and six months ended July 1, 2016, respectively. The acquired programs and contract intangible assets are amortized over their respective estimated useful lives in proportion to the pattern of economic benefit based on expected future discounted cash flows. The acquired backlog and software and technology intangible assets, as well as the Company's existing customer relationships and software and technology intangible assets, are amortized on a straight-line basis over their estimated useful lives.

The estimated annual amortization expense as of June 30, 2017, was as follows:



Fiscal Year Ending
	(in millions)
2017 (remainder of year)	$	149
2018	206
2019	180
2020	132
2021	111
2022 and thereafter	224
	$	1,002

The acquired asset balances related to the Transactions may change upon final valuation (see "Note 2–Acquisitions").

Property, Plant and Equipment

6 Months Ended

Jun. 30, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, plant and equipment, net, including preliminary fair value of those acquired through the acquisition of the IS&GS Business, consisted of the following:



	June 30, 2017			December 30, 2016
	(in millions)
Computers and other equipment	$	191		$	172
Leasehold improvements	167			161
Buildings and improvements	54			104
Office furniture and fixtures	35			35
Land	49			57
Construction in progress	8			12
	504			541
Less: accumulated depreciation and amortization	(289		)	(282		)
	$	215		$	259

Depreciation expense was $13 million and $26 million for the quarter and six months ended June 30, 2017, respectively, and $7 million and $14 million for the quarter and six months ended July 1, 2016, respectively. The acquired asset balances related to the Transactions may change upon final valuation (see "Note 2–Acquisitions").

Derivative Instruments

6 Months Ended

Jun. 30, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

The Company manages its risk to changes in interest rates through the use of derivative instruments. The Company does not hold derivative instruments for trading or speculative purposes. For fixed rate borrowings, the Company uses variable interest rate swaps, effectively converting fixed rate borrowings to variable rate borrowings. These swaps are designated as fair value hedges. For variable rate borrowings, the Company uses fixed interest rate swaps, effectively converting a portion of the variable rate borrowings to fixed rate borrowings. These swaps are designated as cash flow hedges.

Fair Value Hedges

The Company has interest rate swap agreements to hedge the fair value of the $450 million fixed rate 4.45% senior secured notes maturing in December 2020 (the “Notes”). The objective of these instruments is to hedge the Notes against changes in fair value due to the variability in the six-month LIBOR rate (the benchmark interest rate). Under the terms of the interest rate swap agreements, the Company will receive semi-annual interest payments at the coupon rate of 4.45% and will pay variable interest based on the six-month LIBOR rate.

The interest rate swaps were accounted for as a fair value hedge of the Notes and qualified for the shortcut method of hedge accounting, which allows for the assumption of no ineffectiveness reported in earnings. The resulting changes in the fair value of the interest rate swaps are fully offset by the changes in the fair value of the underlying debt (the hedged item).

The fair value of the Notes is stated at an amount that reflects changes in the benchmark interest rate, the six-month LIBOR rate, subsequent to the inception of the interest rate swaps through the reporting date.

Cash Flow Hedges

In August 2016, the Company entered into interest rate swap agreements to hedge the cash flows with respect to $1.2 billion of the Company's variable rate senior secured term loans (the "Variable Rate Loans"). The objective of these instruments is to reduce variability in the forecasted interest payments of the Company's Variable Rate Loans, which is based on the LIBOR rate. Under the terms of the interest rate swap agreements, which mature in December 2021, the Company will receive monthly variable interest payments based on the one-month LIBOR rate and will pay interest at a fixed rate of 1.08%. The counterparties to these agreements are financial institutions.

The interest rate swaps were accounted for as a cash flow hedge of the Variable Rate Loans and qualified for hedge accounting treatment through the application of the long-haul method, which involves the comparison of cumulative changes in the fair value of the swap to the cumulative change in fair value of scheduled interest payments on the notional value (the perfectly effective hypothetical or "PEH"). The effective portion of the gain/loss on the swap is reported as a component of other comprehensive income/loss and will be reclassified into earnings on the dates the interest payments impact earnings. The amount of ineffectiveness recorded in the earnings is equal to the excess of the cumulative change in fair value of the swap over the cumulative change in the fair value of the PEH.

The fair value of the interest rate swaps was as follows:



	Balance sheet line item	June 30, 2017		December 30, 2016
		(in millions)
Fair value interest rate swaps	Other assets	$	5	$	3
Cash flow interest rate swaps	Other assets	25		26

The effect of the Company's cash flow hedge on other comprehensive income and earnings for the periods presented was as follows:



	Three Months Ended			Six Months Ended
	June 30, 2017			June 30, 2017
	(in millions)
Effective portion recognized in other comprehensive income	$	(4	)	$	(3	)
Effective portion reclassified from accumulated other comprehensive income (loss) to earnings	—			1
Ineffective portion recognized in earnings	1			1

The Company expects to reclassify gains of $3 million from accumulated other comprehensive income (loss) into earnings during the next 12 months.

The cash flows associated with both interest rate swaps are classified as operating activities in the condensed consolidated statements of cash flows.

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

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+ Details

Debt

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Debt

The Company's long-term debt consisted of the following:



	Stated interest rate	Effective interest rate	June 30, 2017⁽¹⁾		December 30, 2016⁽¹⁾
			(in millions)
Senior secured notes:
$450 million notes, due December 2020	4.45%	4.53%	$	453	$	451
$300 million notes, due December 2040	5.95%	6.03%	216		216
Senior secured term loans:
$400 million Term Loan A, due August 2019	3.06%	4.04%	89		123
$690 million Term Loan A, due August 2021	3.06%	3.63%	661		676
$310 million Term Loan A, due August 2021	3.06%	3.60%	297		304
$1,131 million Term Loan B, due August 2023	3.31%	3.67%	1,105		1,110
Senior unsecured notes:
$250 million notes, due July 2032	7.13%	7.43%	246		246
$300 million notes, due July 2033	5.50%	5.88%	158		158
Capital leases due on various dates through fiscal 2020	0%-5.94%	Various	6		3
Total long-term debt			3,231		3,287
Less: current portion			84		62
Total long-term debt, net of current portion			$	3,147	$	3,225

⁽¹⁾

The carrying amounts of the senior secured term loans and notes and unsecured notes as of June 30, 2017, and December 30, 2016, include the remaining principal outstanding of $3,270 million and $3,336 million, respectively, plus $5 million and $3 million, respectively, related to the fair value of the interest rate swaps (see "Note 9–Derivative Instruments"), less unamortized debt discounts of $41 million and $46 million, respectively, less deferred debt issuance costs of $9 million for both periods.

The interest rate on the Company's senior secured term loans is determined based on the LIBOR rate plus a margin. The margin for the Term Loan A loans ranges from 1.75% to 2.25%, depending on the Company's senior secured leverage ratio, and is computed on a quarterly basis. At June 30, 2017, the current margin on Term Loan A was 2.00%.

In February 2017, Leidos repriced the Company's senior secured $1.1 billion Term Loan B, due August 2023. As a result, the margin on Term Loan B was reduced by 50 basis points to 2.25% and the six month call provision was extended an additional six months. The repricing of the term loan became effective on February 16, 2017.

In addition to the required quarterly payments on the Company's term loans, the Company prepaid $25 million of its senior secured $400 million Term Loan A, due August 2019, on June 30, 2017.

Principal of the Company's variable rate senior secured term loans is payable on a quarterly basis, with the majority of the principal due at maturity. Interest on the variable rate senior secured term loans is payable on a periodic basis, which must be at least quarterly. Interest on the senior fixed rate secured notes and unsecured notes is payable on a semi-annual basis with principal payments due at maturity.

Amortization for the senior secured term loans and notes and unsecured notes was $3 million and $7 million for the quarter and six months ended June 30, 2017, respectively. Amortization for the senior secured notes and unsecured notes was immaterial for the quarter and six months ended July 1, 2016.

The Company has a revolving credit facility providing up to $750 million in secured borrowing capacity at interest rates determined based upon the LIBOR rate plus a margin that is subject to step-down provisions based on the Company's senior secured leverage ratio. The maturity date of this credit facility is August 2021. As of June 30, 2017 and December 30, 2016, there were no borrowings outstanding under the credit facility.

The senior secured term loans and notes, unsecured notes and revolving credit facility are fully and unconditionally guaranteed and contain certain customary restrictive covenants, including among other things, restrictions on the Company's ability to create liens and enter into sale and leaseback transactions under certain circumstances. The Company was in compliance with all covenants as of June 30, 2017.

Accumulated Other Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2017

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

The components of accumulated other comprehensive income (loss) were as follows:



	Foreign currency translation adjustments			Unrecognized (loss) gain on derivative instruments			Pension liability adjustments			Total accumulated other comprehensive income (loss)
	(in millions)
Balance at January 1, 2016	$	—		$	(4	)	$	(4	)	$	(8	)
Other comprehensive (loss) income	(8		)	26			1			19
Taxes	1			(10		)	2			(7		)
Reclassification from accumulated other comprehensive income (loss)	—			(2		)	(6		)	(8		)
Balance at December 30, 2016	(7		)	10			(7		)	(4		)
Other comprehensive income (loss)	15			(1		)	—			14
Taxes	(2		)	1			—			(1		)
Reclassification from accumulated other comprehensive income (loss)	—			(1		)	—			(1		)
Balance at June 30, 2017	$	6		$	9		$	(7	)	$	8

Reclassifications for unrecognized (loss) gain on derivative instruments associated with outstanding debt are recorded in "Interest expense" in the Company's condensed consolidated statements of income.

Reclassifications for pension liability adjustments are recorded in "Selling, general and administrative expenses" in the Company's condensed consolidated statements of income.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
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+ Details

Earnings Per Share (EPS)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Earnings Per Share (EPS)

Earnings Per Share ("EPS")

The following table provides a reconciliation of the weighted average number of shares outstanding used to compute basic and diluted EPS for the periods presented:



	Three Months Ended		Six Months Ended
	June 30, 2017	July 1, 2016	June 30, 2017	July 1, 2016
	(in millions)
Basic weighted average number of shares outstanding	151	73	151	72
Dilutive common share equivalents—stock options and other stock awards	2	1	2	2
Diluted weighted average number of shares outstanding	153	74	153	74

Anti-dilutive stock-based awards are excluded from the weighted average number of shares outstanding used to compute diluted EPS. For the quarter and six months ended June 30, 2017 and July 1, 2016, there were a total of 1 million of outstanding stock options and vesting stock awards that were antidilutive.

Supplementary Cash Flow Information

6 Months Ended

Jun. 30, 2017

Supplemental Cash Flow Information [Abstract]

Supplementary Cash Flow Information

Supplementary cash flow information, including non-cash activities, for the periods presented was as follows:



	Six Months Ended
	June 30, 2017		July 1, 2016
	(in millions)
Supplementary cash flow information:
Cash paid for interest	$	59	$	43
Cash paid for income taxes, net of refunds	107		38
Non-cash financing activity:
Capital lease obligation	6		—

Business Segments

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Business Segments

During the quarter ended March 31, 2017, the Company completed its business reorganization, which resulted in identification of three reportable segments and corporate expenses. The Company's operations and the new reportable segments are aligned around the the nature of work and customers it serves. The Company commenced operating and reporting under the new organizational structure effective the beginning of fiscal 2017.

At June 30, 2017, the Company's reportable segments and corporate expenses were:

•

Defense Solutions – delivers cutting edge technology and services to the DoD, military services, the U.S. Intelligence Community, DHS, agencies of U.S. allies abroad and other federal and civilian customers. The Company's Defense Solutions business is focused on cybersecurity, data analytics, IT modernization and software development, as well as technology to support intelligence, surveillance and reconnaissance services.


•	Civil – provides services and solutions to civil agencies of the U.S. Government and commercial customers. The Company's Civil business is focused on software development, operations and sustainment, enterprise IT modernization, systems engineering and cyber services.

•

Health – provides services and solutions to the Defense Health Agency, Veterans Administration, HHS, other civil health agencies of the U.S. Government and commercial healthcare providers. The Company's Health business is focused on enterprise IT modernization, software development, data analytics, electronic health record implementation, mission critical operations and sustainment, life sciences and public health.


•	Corporate expenses – includes the operations of various corporate activities and certain expense items that are not reimbursed by the Company's U.S. Government customers.

The segment information for the periods presented, of which the prior period has been recast to reflect the Company's current reportable segment structure, was as follows:



	Three Months Ended						Six Months Ended
	June 30, 2017			July 1, 2016			June 30, 2017			July 1, 2016
	(in millions)
Revenues:
Defense Solutions	$	1,243		$	785		$	2,537		$	1,565
Civil	875			300			1,717			661
Health	454			203			897			374
Corporate expenses	(1		)	—			—			—
Total revenues	$	2,571		$	1,288		$	5,151		$	2,600

Operating income (loss):
Defense Solutions	$	63		$	60		$	142		$	131
Civil	66			20			120			42
Health	74			18			121			34
Corporate expenses	(37		)	(23		)	(76		)	(43		)
Total operating income	$	166		$	75		$	307		$	164

The financial performance measures used to evaluate segment performance are revenues and operating income. As a result, "Other income (expense), net," "Interest income," "Interest expense" and "Income tax expense," as reported in the condensed consolidated financial statements are not allocated to the Company's segments. Under U.S. Government Cost Accounting Standards, indirect costs including depreciation expense are collected in numerous indirect cost pools, which are then collectively allocated out to the Company’s reportable segments based on a representative causal or beneficial relationship of the costs in the pool to the costs in the base.

Asset information by segment is not a key measure of performance used by the Company's chief operating decision maker, currently the Chairman and Chief Executive Officer.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

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+ Details

Contingencies	6 Months Ended
Contingencies	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies Legal Proceedings MSA Venture On November 10, 2015, Mission Support Alliance, LLC ("MSA"), a joint venture with Jacobs Engineering Group, Inc. and Centerra Group, LLC, received a final decision of the Department of Energy ("DoE") contracting officer for the Mission Support Contract concluding that certain payments to MSA by DoE for the performance of IT services by Lockheed Martin Services, Inc. (“LMSI”) under a subcontract to MSA constituted alleged affiliate fees in violation of the Federal Acquisition Regulation (the "FAR"). Lockheed Martin Integrated Technology LLC (now known as Leidos Integrated Technology LLC) is a member entity of MSA. At the same time, the contracting officer advised MSA that he would not approve certain provisional fee payments to MSA pending resolution of the matters set forth in his decision. Subsequent to the contracting officer's final decision, MSA, LMSI, and Lockheed Martin Corporation received notice from the U.S. Attorney's Office for the Eastern District of Washington that the U.S. Government had initiated a False Claims Act investigation into the facts surrounding this dispute, and each of MSA, LMSI and Lockheed Martin Corporation have produced information in response to Civil Investigative Demands from the U.S. Attorney's Office. In addition, the U.S. Attorney's office has advised that a parallel criminal investigation is open, although no subjects or targets of the investigation have been identified. Since this issue first was raised by the DoE, MSA has asserted that the IT services performed by LMSI under a fixed price/fixed unit rate subcontract approved by the DoE meet the definition of a "commercial item" under the FAR and any profits earned on that subcontract are permissible. MSA filed an appeal of the contracting officer's decision with the Civilian Board of Contract Appeals and that appeal is pending, but has been stayed pending resolution of the False Claims Act investigation. Subsequent to the filing of MSA's appeal, the contracting officer demanded that MSA reimburse the DoE in the amount of $64 million, which was his estimate of the profits earned during the period from 2010 to 2014 by LMSI. The DoE has deferred that demand, pending resolution of the appeal, but to date the demand has not been rescinded. MSA and the other members of MSA have indicated they believe if MSA incurs a liability in this matter, then Leidos Integrated Technology, LLC is responsible to MSA for the loss. Under the terms of the Separation Agreement, Lockheed Martin has agreed to indemnify the Company for 100% of any damages in excess of $38 million up to $64 million, and 50% of any damages in excess of $64 million, with respect to claims asserted against MSA related to this matter. At June 30, 2017, the Company has a liability of $39 million and an indemnification asset of $1 million recorded in the condensed consolidated balance sheets. Securities Litigation Between February and April 2012, alleged stockholders filed three putative securities class actions. One case was withdrawn and two cases were consolidated in the U.S. District Court for the Southern District of New York in In Re: SAIC, Inc. Securities Litigation. The consolidated securities complaint named as defendants the Company, a former chief financial officer, two former chief executive officers, a former group president and the former program manager on the Company's contract to develop and implement an automated time and attendance and workforce management system for certain agencies of the City of New York ("CityTime") and was filed purportedly on behalf of all purchasers of the Company's common stock from April 11, 2007, through September 1, 2011. The consolidated securities complaint asserted claims under Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 based on allegations that the Company and individual defendants made misleading statements or omissions about the Company’s revenues, operating income and internal controls in connection with disclosures relating to the CityTime project. The plaintiffs sought to recover from the Company and the individual defendants an unspecified amount of damages class members allegedly incurred by buying Leidos' stock at an inflated price. On October 1, 2013, the District Court dismissed many claims in the complaint with prejudice and on January 30, 2014, the District Court entered an order dismissing all remaining claims with prejudice and without leave to replead. The plaintiffs then appealed to the United States Court of Appeals for the Second Circuit. On March 29, 2016, the Second Circuit issued an opinion affirming in part, and vacating in part, the District Court's ruling. In particular, the Second Circuit held that the plaintiffs should be permitted to pursue omissions claims against the Company with respect to the annual report the Company filed on Form 10-K on March 25, 2011; the Second Circuit affirmed dismissal of all other claims, including all the claims against the individual defendants, and the case was remanded to the District Court. On September 23, 2016, the District Court issued an order clarifying that the applicable class period relating to the March 2011 Form 10-K ends on June 2, 2011, not September 1, 2011, as plaintiffs argued. The Company filed a petition for a writ of certiorari in the U.S. Supreme Court, which was granted on March 27, 2017. A decision is expected by June 2018. The District Court granted the Company’s request to stay all proceedings, including discovery, pending the outcome at the Supreme Court. Any potential loss relating to this matter is not reasonably estimable due to unresolved questions of fact and law. However, the Company does not expect any ultimate liability to have a material effect on the Company’s financial position, liquidity or capital resources. Greek Government Contract In 2003, the Company entered into a firm-fixed-price contract with the Hellenic Republic of Greece to provide a Command, Control, Communications, Coordination and Integration System. The Greek government disputed the contract balance owed to the Company and has not paid the Company’s final invoice. In 2013, the Company received an arbitral award by the International Chamber of Commerce for $45 million, which has not been satisfied. In January 2017, the U.S. District Court granted an order to enforce the arbitration award and entered judgment in the Company's favor, for which the award was subsequently increased to $63 million. The Greek government sought to annul the award through separate litigation in the Greek courts, however, on July 27, 2017, the Athens Court of Appeals issued a final decision rejecting the government's position. Based on the complex nature of this contractual situation and the difficulties encountered to date, significant uncertainties exist and the Company is unable to reliably estimate the ultimate outcome. Other The Company is also involved in various claims and lawsuits arising in the normal conduct of its business, none of which, in the opinion of the Company’s management, based upon current information, will likely have a material adverse effect on the Company’s condensed consolidated financial position, results of operations, or cash flows. Other Contingencies VirnetX, Inc. In fiscal 2007, the Company transferred several patents to VirnetX Inc., a subsidiary of VirnetX Holding Corp. In consideration of this transfer, the Company received certain license rights and the right to receive a percentage of the consideration received in patent infringement or enforcement claims against third parties. In November 2012, a jury found that Apple Corporation infringed two of the patents that the Company previously transferred to VirnetX and awarded $368 million to VirnetX, but the United States Court of Appeals for the Federal Circuit vacated this award. Although VirnetX petitioned the appeals court for an en banc review, this request was denied and the case was remanded to the Federal District Court for further proceedings, including a new jury trial which began on January 25, 2016. On February 3, 2016, the jury in the United States Court for the Eastern District of Texas, Tyler Division, awarded VirnetX $626 million in a verdict against Apple for willful infringement of four VirnetX patents. However, on July 29, 2016, the court issued a new order in the pending litigation against Apple, Case No. 6:10-cs-417 ("Apple I") and Case No. 6:12-cv-855 ("Apple II"), vacating its previous order consolidating the two cases and ordering the parties to retry them as separate cases. On September 30, 2016, a jury in the United States Court for the Eastern District of Texas, Tyler Division, in the Apple I case, awarded VirnetX $302 million in a verdict against Apple for infringing four VirnetX patents. A jury trial in the Apple II case is expected to be scheduled by the court shortly after the conclusion of the Apple I case. Under its agreements with VirnetX, Leidos would receive 25% of the proceeds obtained by VirnetX after reduction for attorneys' fees and costs. However, it is expected that Apple will appeal the verdict and no assurances can be given when or if the Company will receive any proceeds in connection with this jury award. In addition, if the Company receives any proceeds, the Company is required to pay a royalty to the customer who paid for the development of the technology. The Company does not have any assets or liabilities recorded in connection with this matter as of June 30, 2017. Government Investigations and Reviews The Company is routinely subject to investigations and reviews relating to compliance with various laws and regulations with respect to its role as a contractor to federal, state and local government customers and in connection with performing services in countries outside of the United States. Adverse findings could have a material adverse effect on the Company’s business, financial position, results of operations and cash flows due to its reliance on government contracts. Indirect cost audits by the Defense Contract Audit Agency remain open for fiscal 2012 and subsequent years for Leidos, Inc., and fiscal 2010 and subsequent years for Leidos Innovations. Although the Company has recorded contract revenues upon an estimate of costs that the Company believes will be approved upon final audit or review, the Company cannot predict the outcome of any ongoing or future audits or reviews and adjustments, and if future adjustments exceed the Company’s estimates, its profitability would be adversely affected. As of June 30, 2017, the Company believes it has adequately reserved for potential adjustments from audits or reviews of contract costs.

- Definition

The entire disclosure for loss and gain contingencies. Describes any existing condition, situation, or set of circumstances involving uncertainty as of the balance sheet date (or prior to issuance of the financial statements) as to a probable or reasonably possible loss incurred by an entity that will ultimately be resolved when one or more future events occur or fail to occur, and typically discloses the amount of loss recorded or a range of possible loss, or an assertion that no reasonable estimate can be made.

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+ Details

Commitments	6 Months Ended
Commitments	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments	Commitments The Company has outstanding letters of credit of $82 million as of June 30, 2017, principally related to guarantees on contracts. The Company also has outstanding surety bonds in the amount of $157 million, principally related to performance and subcontractor payment bonds on the Company’s contracts. The outstanding letters of credit and surety bonds have various terms with the majority of the letters of credit and bonds expiring over the next four fiscal years. Additionally, the Company has outstanding performance guarantees and cross-indemnity agreements in connection with certain aspects of its business. As of June 30, 2017, the Company is not aware of any existing event of default that would require it to satisfy any of these guarantees.

Basis of Presentation and Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Nature of Operations and Basis of Presentation	Nature of Operations and Basis of Presentation Leidos Holdings, Inc. ("Leidos") is a holding company whose direct 100%-owned subsidiaries and principal operating companies are Leidos, Inc. and Leidos Innovations Corporation ("Leidos Innovations"). Leidos is a FORTUNE 500^® science and technology company that provides technology and engineering services and solutions in the defense, intelligence, civil and health markets. Leidos' domestic customers include the U.S. Department of Defense ("DoD"), the U.S. Intelligence Community, the U.S. Department of Homeland Security ("DHS"), the Federal Aviation Administration ("FAA"), the Department of Health and Human Services ("HHS"), U.S. Government civil agencies and state and local government agencies. Leidos' international customers include foreign governments and their agencies, primarily located in the United Kingdom, the Middle East and Australia. Unless indicated otherwise, references to the "Company," "we," "us" and "our" refer collectively to Leidos Holdings, Inc. and its consolidated subsidiaries. The unaudited condensed consolidated financial statements of Leidos include the balances of its majority-owned and 100%-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. The accompanying unaudited condensed financial information has been prepared in accordance with the rules of the U.S. Securities and Exchange Commission ("SEC") and accounting principles generally accepted in the United States of America ("GAAP"). Certain disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingencies at the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting periods. Management evaluates these estimates and assumptions on an ongoing basis, including those relating to estimated profitability of long-term contracts, indirect billing rates, allowances for doubtful accounts, inventories, fair value and impairment of intangible assets and goodwill, income taxes, stock-based compensation expense and contingencies. These estimates have been prepared by management on the basis of the most current and best available information; however, actual results could differ materially from those estimates. In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all adjustments, which consist of normal recurring adjustments, necessary for a fair presentation thereof. The results reported in these unaudited condensed consolidated financial statements are not necessarily indicative of the results that may be expected for the entire year. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K filed on February 24, 2017. During the quarter ended March 31, 2017, the Company completed its business reorganization, which resulted in identification of three reportable segments (Defense Solutions, Civil, Health) and corporate expenses. The Company commenced operating and reporting under the new organizational structure effective the beginning of fiscal 2017. As a result of this change, prior year segment results and disclosures have been recast to reflect the new reportable segments (see "Note 14–Business Segments"). Amounts in the prior year condensed consolidated statements of income that have been reclassified to conform to the current year presentation include, "Restructuring expenses," which were previously aggregated within "Selling, general and administrative expenses," and "Interest expense, net" which has been disaggregated into "Interest income" and "Interest expense."
Changes in Estimates on Contracts	Changes in Estimates on Contracts Changes in estimates related to long-term contracts accounted for using the percentage of completion method of accounting are recognized in the period in which such changes are made for the inception-to-date effect of the changes, with the exception of contracts acquired through the acquisition of the IS&GS Business (see "Note 2–Acquisitions"), where the adjustment is made for the period commencing from the date of acquisition. Changes in these estimates can occur over the contract performance period for a variety of reasons, including changes in contract scope, contract cost estimates and estimated incentive or award fees.
Accounting Standards Updates Adopted	Accounting Standards Updates Adopted In March 2016, the FASB issued ASU 2016-09 Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. The ASU requires that an entity, (i) recognize excess tax benefits and deficiencies related to employee share-based payment transactions as an income tax expense or benefit in the income statement rather than in equity; (ii) present the excess tax benefits as an operating activity on the statement of cash flows versus current guidance to present them as financing activities; and, (iii) elect to either recognize stock forfeitures as they occur or estimate them. During the quarter ended July 1, 2016, the Company elected to early adopt the provisions of the ASU prospectively from January 2, 2016, including continuation of estimating forfeitures instead of recording them as they occur. Consequently, the Company recognized a $3 million and $7 million discrete tax benefit for the quarter and six months ended July 1, 2016, respectively, and operating cash flows for the six months ended July 1, 2016, increased $7 million with a corresponding decrease to financing cash flows. In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. This ASU eliminates Step 2 of the goodwill impairment test and simplifies how the amount of an impairment loss is determined. The update is effective for public companies in the beginning of fiscal year 2020 and shall be applied on a prospective basis. Early adoption is permitted for goodwill impairment tests performed on testing dates after January 1, 2017. The Company adopted the provisions of ASU 2017-04 prospectively in the first quarter of fiscal 2017 and the standard did not have a material effect on the Company's consolidated financial position, results of operations or cash flows. In May 2017, the FASB issued ASU 2017-09, Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting. This ASU provides clarification on when to apply modification accounting for a stock-based award to reduce diversity in practice. The update is effective for public companies in the beginning of fiscal year 2018 and shall be applied on a prospective basis. Early adoption is permitted for public business entities. The Company adopted the provisions of ASU 2017-09 prospectively in the second quarter of fiscal 2017 and the standard did not have a material effect on the Company's consolidated financial position, results of operations or cash flows.
Accounting Standards Updates Issued But Not Yet Adopted	Accounting Standards Updates Issued But Not Yet Adopted In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606). This ASU affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of non-financial assets unless those contracts are within the scope of other standards (for example, insurance contracts or lease contracts). This ASU will supersede all revenue recognition requirements in Topic 605, Revenue Recognition, and industry-specific guidance throughout the Industry Topics of the codification. The guidance's core principle is that an entity should recognize revenue to depict the transfer of control for promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In applying the revenue principles, an entity will identify the contract(s) with a customer, identify the performance obligations, determine the transaction price, allocate the transaction price to the performance obligations and recognize revenue when the performance obligation is satisfied (i.e., either over time or point in time). The ASU further states that an entity should disclose sufficient information to enable users of financial statements to understand the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. The Company will adopt the new revenue standard in the beginning of fiscal 2018, under the modified retrospective method, where the cumulative effect is recognized at the date of initial adoption. Based on the ongoing assessments, the Company believes the timing of and amount of revenue recognition will largely remain consistent between the current revenue standard and the revised revenue standard for the majority of the Company's contracts. Specifically, for time-and-materials, fixed-price-level-of-effort, cost-plus-award-fee, cost-plus-incentive fee and fixed-price-incentive fee contracts, the Company will continue to recognize revenue over time as work progresses because of the continuous transfer of control to the customer, generally using an input measure (e.g., cost incurred) to reflect progress. The Company tentatively expects that differences, if any, in revenue recognition between the current and revised revenue standards will primarily occur within the firm-fixed-price contracts as a result of the identification of new performance obligations. As of the end of the second quarter, the Company is still in the process of reviewing contracts and assessing the financial statement impact of the adoption of the new standard, if any.

Basis of Presentation and Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2017

Accounting Policies [Abstract]

Schedule of Changes In Estimates On Contracts

Changes in estimates on contracts for the periods presented were as follows:



	Three Months Ended				Six Months Ended
	June 30, 2017		July 1, 2016		June 30, 2017		July 1, 2016
	(in millions, except per share amounts)
Net favorable impact to income from continuing operations before taxes	$	40	$	5	$	62	$	13
Impact on diluted EPS from continuing operations attributable to Leidos common stockholders	$	0.17	$	0.04	$	0.26	$	0.11

Acquisitions (Tables)

6 Months Ended

Jun. 30, 2017

Business Combinations [Abstract]

Schedule of Integration Costs

The Company incurred the following expenses related to the acquisition and integration of the IS&GS Business:



	Three Months Ended				Six Months Ended
	June 30, 2017		July 1, 2016		June 30, 2017		July 1, 2016
	(in millions)
Acquisition costs	$	—	$	7	$	1	$	13
Integration costs	16		8		34		11
Total acquisition and integration costs	$	16	$	15	$	35	$	24

The preliminary purchase consideration for the acquisition of the IS&GS Business was as follows (in millions):



Value of common stock issued to Lockheed Martin stockholders⁽¹⁾	$	2,929
Equity consideration for replacement awards⁽²⁾	9
Preliminary working capital adjustments	55
Preliminary purchase price	$	2,993

⁽²⁾ The fair value of replacement equity-based awards attributable to pre-Merger service was recorded as part of the consideration transferred in the Merger.

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The preliminary fair values of the assets acquired and liabilities assumed at the date of the Transactions were as follows (in millions):



Cash	$	25
Receivables	954
Inventory, prepaid expenses and other current assets	68
Property, plant and equipment	91
Deferred tax assets	8
Intangible assets	1,202
Other assets	57
Accounts payable and accrued liabilities	(713		)
Accrued payroll and employee benefits	(190		)
Long-term debt, current portion	(23		)
Deferred tax liabilities	(356		)
Long-term debt, net of current portion	(1,780		)
Other long-term liabilities	(52		)
Total identifiable net liabilities assumed	(709		)
Non-controlling interest	(13		)
Goodwill	3,715
Preliminary purchase price	$	2,993

Finite-Lived and Indefinite-Lived Intangible Assets Acquired as Part of Business Combination

The following table summarizes the preliminary fair value of intangible assets acquired at the date of acquisition and the related weighted average amortization period:



	Weighted average amortization period	Fair value
	(in years)	(in millions)
Programs and contract intangibles⁽¹⁾	9.0	$	997
Backlog	1.4	178
Software and technology	1.2	27
Total	7.8	$	1,202

⁽¹⁾ The weighted average amortization period is estimated based on the projected economic benefits associated with these assets. Refer to "Note 7–Intangible Assets" for additional information.

Business Acquisition, Pro Forma Information

The pro forma financial information is not intended to reflect the actual results of operations that would have occurred if the acquisition had been completed on January 3, 2015, nor is it intended to be an indication of future operating results.



	Three Months Ended		Six Months Ended
(unaudited)	July 1, 2016		July 1, 2016
	(in millions, except per share amounts)
Revenues	$	2,624	$	5,261
Income from continuing operations	103		150
Income from continuing operations attributable to Leidos common stockholders	102		147
Earnings per share:
Basic	$	0.68	$	0.99
Diluted	0.68		0.97

Restructuring Expenses (Tables)

6 Months Ended

Jun. 30, 2017

Restructuring and Related Activities [Abstract]

Restructuring and Related Costs

The restructuring expenses related to this program were as follows:



	Three Months Ended		Six Months Ended
	June 30, 2017		June 30, 2017
	(in millions)
Severance costs	$	2	$	12
Lease termination expenses	4		7
Restructuring expenses related to the IS&GS Business	$	6	$	19

Schedule of Restructuring Reserve by Type of Cost

The restructuring liability related to this program at June 30, 2017, was:



	Severance costs			Lease termination expenses			Total
	(in millions)
Balance as of December 30, 2016	$	7		$	1		$	8
Charges	12			7			19
Cash payments	(17		)	(6		)	(23		)
Balance as of June 30, 2017	$	2		$	2		$	4

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

The Company's assets measured on a recurring basis at fair value consisted of the following:



	June 30, 2017				December 30, 2016
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in millions)
Financial assets
Derivatives	$	30	$	30	$	29	$	29

Goodwill (Tables)

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in Goodwill by Segment

The following table presents changes in the carrying amount of goodwill by reportable segment as of June 30, 2017 and December 30, 2016:



	Defense Solutions		Civil		Health		Total
	(in millions)
Goodwill at January 1, 2016	$	792	$	244	$	171	$	1,207
Acquisition of the IS&GS Business	1,162		1,487		766		3,415
Goodwill at December 30, 2016	1,954		1,731		937		4,622
Adjustment to original purchase price allocation	72		151		77		300
Goodwill at June 30, 2017	$	2,026	$	1,882	$	1,014	$	4,922

Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets Including Estimates of Assets Acquired

Intangible assets, including the preliminary fair values of those acquired through the acquisition of the IS&GS Business, consisted of the following:



	June 30, 2017							December 30, 2016
	Gross carrying value		Accumulated amortization			Net carrying value		Gross carrying value		Accumulated amortization			Net carrying value
	(in millions)
Finite-lived intangible assets:
Programs and contract intangibles	$	997	$	(91	)	$	906	$	1,450	$	(25	)	$	1,425
Backlog	178		(113		)	65		200		(54		)	146
Software and technology	89		(59		)	30		61		(48		)	13
Customer relationships	6		(5		)	1		6		(5		)	1
Total finite-lived intangible assets	1,270		(268		)	1,002		1,717		(132		)	1,585
Indefinite-lived intangible assets:
Trade names	4		—			4		4		—			4
Total intangible assets	$	1,274	$	(268	)	$	1,006	$	1,721	$	(132	)	$	1,589

Schedule of Amortization Expense for Finite-Lived Intangible Assets

The estimated annual amortization expense as of June 30, 2017, was as follows:



Fiscal Year Ending
	(in millions)
2017 (remainder of year)	$	149
2018	206
2019	180
2020	132
2021	111
2022 and thereafter	224
	$	1,002

Property, Plant and Equipment (Tables)

6 Months Ended

Jun. 30, 2017

Property, Plant and Equipment [Abstract]

Schedule of Property, Plant and Equipment

Property, plant and equipment, net, including preliminary fair value of those acquired through the acquisition of the IS&GS Business, consisted of the following:



	June 30, 2017			December 30, 2016
	(in millions)
Computers and other equipment	$	191		$	172
Leasehold improvements	167			161
Buildings and improvements	54			104
Office furniture and fixtures	35			35
Land	49			57
Construction in progress	8			12
	504			541
Less: accumulated depreciation and amortization	(289		)	(282		)
	$	215		$	259

Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location

The effect of the Company's cash flow hedge on other comprehensive income and earnings for the periods presented was as follows:



	Three Months Ended			Six Months Ended
	June 30, 2017			June 30, 2017
	(in millions)
Effective portion recognized in other comprehensive income	$	(4	)	$	(3	)
Effective portion reclassified from accumulated other comprehensive income (loss) to earnings	—			1
Ineffective portion recognized in earnings	1			1

Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block]

The fair value of the interest rate swaps was as follows:



	Balance sheet line item	June 30, 2017		December 30, 2016
		(in millions)
Fair value interest rate swaps	Other assets	$	5	$	3
Cash flow interest rate swaps	Other assets	25		26

Debt (Tables)

6 Months Ended

Jun. 30, 2017

Debt Disclosure [Abstract]

Schedule of Notes Payable and Long-Term Debt

The Company's long-term debt consisted of the following:



	Stated interest rate	Effective interest rate	June 30, 2017⁽¹⁾		December 30, 2016⁽¹⁾
			(in millions)
Senior secured notes:
$450 million notes, due December 2020	4.45%	4.53%	$	453	$	451
$300 million notes, due December 2040	5.95%	6.03%	216		216
Senior secured term loans:
$400 million Term Loan A, due August 2019	3.06%	4.04%	89		123
$690 million Term Loan A, due August 2021	3.06%	3.63%	661		676
$310 million Term Loan A, due August 2021	3.06%	3.60%	297		304
$1,131 million Term Loan B, due August 2023	3.31%	3.67%	1,105		1,110
Senior unsecured notes:
$250 million notes, due July 2032	7.13%	7.43%	246		246
$300 million notes, due July 2033	5.50%	5.88%	158		158
Capital leases due on various dates through fiscal 2020	0%-5.94%	Various	6		3
Total long-term debt			3,231		3,287
Less: current portion			84		62
Total long-term debt, net of current portion			$	3,147	$	3,225

⁽¹⁾

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
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-Section 50
-Paragraph 3
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
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-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Paragraph 8
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 505
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-Paragraph 6
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 835
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-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644

+ Details

Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2017

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The components of accumulated other comprehensive income (loss) were as follows:



	Foreign currency translation adjustments			Unrecognized (loss) gain on derivative instruments			Pension liability adjustments			Total accumulated other comprehensive income (loss)
	(in millions)
Balance at January 1, 2016	$	—		$	(4	)	$	(4	)	$	(8	)
Other comprehensive (loss) income	(8		)	26			1			19
Taxes	1			(10		)	2			(7		)
Reclassification from accumulated other comprehensive income (loss)	—			(2		)	(6		)	(8		)
Balance at December 30, 2016	(7		)	10			(7		)	(4		)
Other comprehensive income (loss)	15			(1		)	—			14
Taxes	(2		)	1			—			(1		)
Reclassification from accumulated other comprehensive income (loss)	—			(1		)	—			(1		)
Balance at June 30, 2017	$	6		$	9		$	(7	)	$	8

Earnings Per Share (EPS) (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Reconciliation of Weighted Average Number of Shares Outstanding

The following table provides a reconciliation of the weighted average number of shares outstanding used to compute basic and diluted EPS for the periods presented:



	Three Months Ended		Six Months Ended
	June 30, 2017	July 1, 2016	June 30, 2017	July 1, 2016
	(in millions)
Basic weighted average number of shares outstanding	151	73	151	72
Dilutive common share equivalents—stock options and other stock awards	2	1	2	2
Diluted weighted average number of shares outstanding	153	74	153	74

Supplementary Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2017

Supplemental Cash Flow Information [Abstract]

Schedule of Supplementary Cash Flow Information

Supplementary cash flow information, including non-cash activities, for the periods presented was as follows:



	Six Months Ended
	June 30, 2017		July 1, 2016
	(in millions)
Supplementary cash flow information:
Cash paid for interest	$	59	$	43
Cash paid for income taxes, net of refunds	107		38
Non-cash financing activity:
Capital lease obligation	6		—

Business Segments (Tables)

6 Months Ended

Jun. 30, 2017

Segment Reporting [Abstract]

Schedule of Segment Reporting Information by Segment

The segment information for the periods presented, of which the prior period has been recast to reflect the Company's current reportable segment structure, was as follows:



	Three Months Ended						Six Months Ended
	June 30, 2017			July 1, 2016			June 30, 2017			July 1, 2016
	(in millions)
Revenues:
Defense Solutions	$	1,243		$	785		$	2,537		$	1,565
Civil	875			300			1,717			661
Health	454			203			897			374
Corporate expenses	(1		)	—			—			—
Total revenues	$	2,571		$	1,288		$	5,151		$	2,600

Operating income (loss):
Defense Solutions	$	63		$	60		$	142		$	131
Civil	66			20			120			42
Health	74			18			121			34
Corporate expenses	(37		)	(23		)	(76		)	(43		)
Total operating income	$	166		$	75		$	307		$	164

Basis of Presentation and Summary of Significant Accounting Policies (Additional Information) (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Significant Accounting Policies [Line Items]
Cash flows provided by operating activities of continuing operations		$ 89	$ 58
Cash flows used in financing activities of continuing operations		$ 189	61
Leidos, Inc.
Significant Accounting Policies [Line Items]
Ownership interest (in percentage)		100.00%
Accounting Standards Update 2016-09, Excess Tax Benefit Component \| New Accounting Pronouncement, Early Adoption, Effect
Significant Accounting Policies [Line Items]
Share-based compensation, excess tax benefit, amount	$ 3		7
Cash flows provided by operating activities of continuing operations			7
Cash flows used in financing activities of continuing operations			$ 7

Basis of Presentation and Summary of Significant Accounting Policies (Changes in estimates on contracts) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Accounting Policies [Abstract]
Net favorable impact to income from continuing operations before taxes	$ 40	$ 5	$ 62	$ 13
Impact on diluted EPS from continuing operations attributable to Leidos common stockholders (usd per share)	$ 0.17	$ 0.04	$ 0.26	$ 0.11

Acquisitions (Textual) (Details) - Information Systems & Global Solutions Business of Lockheed Martin - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended			6 Months Ended
	Aug. 16, 2016	Jun. 30, 2017	Mar. 31, 2017	Jul. 01, 2016	Jul. 01, 2016
Business Acquisition [Line Items]
Number of shares Lockheed Martin shareholders will receive from Leidos (in shares)	77
Share price (in usd per share)	$ 51.69
Special dividend declared (usd per share)	$ 13.64
Purchase accounting adjustment		$ 303	$ (3)
Fair value of non controlling interest	$ (13)
Goodwill acquired, expected tax deductible amount	$ 414
Acquired intangible assets, weighted average useful life (in years)	7 years 10 months
Intangible acquired, fair value	$ 1,202
Acquisition related costs				$ 7	$ 13
Programs and contract intangibles
Business Acquisition [Line Items]
Acquired intangible assets, weighted average useful life (in years)	9 years
Intangible acquired, fair value	$ 997
Backlog
Business Acquisition [Line Items]
Acquired intangible assets, weighted average useful life (in years)	1 year 4 months 24 days
Intangible acquired, fair value	$ 178
Software and technology
Business Acquisition [Line Items]
Acquired intangible assets, weighted average useful life (in years)	1 year 2 months
Intangible acquired, fair value	$ 27
Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Cumulative adjustment		(8)
Equity Losses of Non-consolidated Subsidiaries [Member]
Business Acquisition [Line Items]
Cumulative adjustment		$ 7

Acquisitions (Purchase price) (Details) - USD ($) $ in Millions	Aug. 16, 2016	Jun. 30, 2017	Dec. 30, 2016	Jan. 01, 2016
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Goodwill		$ 4,922	$ 4,622	$ 1,207
Information Systems & Global Solutions Business of Lockheed Martin
Business Combination, Consideration Transferred [Abstract]
Value of common stock issued to Lockheed Martin stockholders	$ 2,929
Equity consideration for replacement awards	9
Preliminary working capital adjustments	55
Preliminary purchase price	2,993
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Cash	25
Receivables	954
Inventory, prepaid expenses and other current assets	68
Property, plant and equipment	91
Deferred tax assets	8
Intangible assets	1,202
Other assets	57
Accounts payable and accrued liabilities	(713)
Accrued payroll and employee benefits	(190)
Long-term debt, current portion	(23)
Deferred tax liabilities	(356)
Long-term debt, net of current portion	(1,780)
Other long-term liabilities	(52)
Total identifiable net liabilities assumed	(709)
Non-controlling interest	(13)
Goodwill	3,715
Preliminary purchase price	$ 2,993

Acquisitions (Integration Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Business Acquisition [Line Items]
Total acquisition and integration costs	$ 16	$ 15	$ 35	$ 24
Information Systems & Global Solutions Business of Lockheed Martin
Business Acquisition [Line Items]
Acquisition costs	0	7	1	13
Integration costs	16	8	34	11
Total acquisition and integration costs	$ 16	$ 15	$ 35	$ 24

Acquisitions (Pro Forma Information) (Details) - Information Systems & Global Solutions Business of Lockheed Martin - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
	Jul. 01, 2016	Jul. 01, 2016
Business Acquisition [Line Items]
Revenues	$ 2,624	$ 5,261
Income from continuing operations	$ 103	$ 150
Earnings per share:
Basic (usd per share)	$ 0.68	$ 0.99
Diluted (usd per share)	$ 0.68	$ 0.97
Leidos Holdings, Inc.
Business Acquisition [Line Items]
Income from continuing operations	$ 102	$ 147

Divestitures (Narrative) (Details) $ in Millions		1 Months Ended	3 Months Ended	6 Months Ended
Divestitures (Narrative) (Details) $ in Millions	Jul. 24, 2015 USD ($) extension	Apr. 30, 2016 USD ($)	Mar. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	Jul. 01, 2016 USD ($)	Dec. 30, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition of business				$ 0	$ 23
Liability in connection with issuance of a performance guarantee on a contract sold				1,330		$ 1,427
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Plainfield
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal, consideration	$ 102
Proceeds from divestiture of interest	29
Amount of consideration received	$ 73
Proceeds from collections on promissory note			$ 6
Option to extend for one year period, number \| extension	3
Period of extension (in years)	1 year
Note receivable, interest rate, stated, if maturity is extended beyond July 24, 2017 (in percentage)	8.00%
Note receivable, interest rate, stated (in percentage)	6.00%
Collection deferred				$ 4
Civil \| Disposal Group, Disposed of by Sale, Not Discontinued Operations \| One Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition of business		$ 23
Receivable, net		73
Other assets		3
Accounts payable and accrued liabilities		63
Liability in connection with issuance of a performance guarantee on a contract sold		6
Other Operating Income (Expense) \| Civil \| Disposal Group, Disposed of by Sale, Not Discontinued Operations \| One Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of business		3
Selling expense		$ 1

Restructuring Expenses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Restructuring Expenses (Details) - USD ($) $ in Millions	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Restructuring Reserve [Roll Forward]
Restructuring expenses	$ 6	$ 1	$ 19	$ 1
Restructuring Due To IS&GS Acquisition
Restructuring Reserve [Roll Forward]
Restructuring reserve, opening balance			8
Restructuring expenses	6		19
Cash payments			(23)
Restructuring reserve, closing balance	4		$ 4
Period to settle restructuring liability, minimum (in years)			1 year
Restructuring Due To IS&GS Acquisition \| Severance costs
Restructuring Reserve [Roll Forward]
Restructuring reserve, opening balance			$ 7
Restructuring expenses	2		12
Cash payments			(17)
Restructuring reserve, closing balance	2		2
Restructuring Due To IS&GS Acquisition \| Lease termination expenses
Restructuring Reserve [Roll Forward]
Restructuring reserve, opening balance			1
Restructuring expenses	4		7
Cash payments			(6)
Restructuring reserve, closing balance	$ 2		$ 2

Fair Value Measurements (Details) - USD ($)	Jun. 30, 2017	Dec. 30, 2016	Aug. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	$ 3,231,000,000	$ 3,287,000,000
Asset Derivatives \| Designated as Hedging Instrument
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Hedged instrument, face amount	1,150,000,000		$ 1,200,000,000
Stated interest rate (in percentage)			1.08%
Asset Derivatives \| Designated as Hedging Instrument \| Notes Which Mature In December 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Hedged instrument, face amount	$ 450,000,000
Stated interest rate (in percentage)	4.45%
Asset Derivatives \| Designated as Hedging Instrument \| Notes Which Mature In December 2020 \| Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Stated interest rate (in percentage)	4.45%
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	$ 30,000,000	29,000,000
Fair value of notes receivable	91,000,000
Fair value of debt instrument	3,200,000,000	3,300,000,000
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	30,000,000	29,000,000
Fair value of debt instrument	$ 3,300,000,000	$ 3,300,000,000

Goodwill (Schedule of Changes in Goodwill by Segment) (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 30, 2016
Goodwill [Roll Forward]
Beginning balance, Goodwill	$ 4,622	$ 1,207
Acquisition of the IS&GS Business		3,415
Adjustment to original purchase price allocation	300
Ending balance, Goodwill	4,922	4,622
Defense Solutions
Goodwill [Roll Forward]
Beginning balance, Goodwill	1,954	792
Acquisition of the IS&GS Business		1,162
Adjustment to original purchase price allocation	72
Ending balance, Goodwill	2,026	1,954
Civil
Goodwill [Roll Forward]
Beginning balance, Goodwill	1,731	244
Acquisition of the IS&GS Business		1,487
Adjustment to original purchase price allocation	151
Ending balance, Goodwill	1,882	1,731
Health
Goodwill [Roll Forward]
Beginning balance, Goodwill	937	171
Acquisition of the IS&GS Business		766
Adjustment to original purchase price allocation	77
Ending balance, Goodwill	$ 1,014	$ 937

Intangible Assets (Summary) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 30, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying value	$ 1,270	$ 1,717
Accumulated amortization	(268)	(132)
Net carrying value	1,002	1,585
Total intangible assets, Gross carrying value	1,274	1,721
Total intangible assets, Net carrying value	1,006	1,589
Programs and contract intangibles
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying value	997	1,450
Accumulated amortization	(91)	(25)
Net carrying value	906	1,425
Backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying value	178	200
Accumulated amortization	(113)	(54)
Net carrying value	65	146
Software and technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying value	89	61
Accumulated amortization	(59)	(48)
Net carrying value	30	13
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross carrying value	6	6
Accumulated amortization	(5)	(5)
Net carrying value	1	1
Trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 4	$ 4

Intangible Assets (Amortization of Intangibles) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
2017 (remainder of year)	$ 149
2018	206
2019	180
2020	132
2021	111
2022 and thereafter	224
Net carrying value	$ 1,002	$ 1,585

Intangible Assets (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 67	$ 2	$ 136	$ 3

Property, Plant and Equipment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016	Dec. 30, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 504		$ 504		$ 541
Less: accumulated depreciation and amortization	(289)		(289)		(282)
Property, plant and equipment, net	215		215		259
Depreciation	13	$ 7	26	$ 14
Computers and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	191		191		172
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	167		167		161
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	54		54		104
Office furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	35		35		35
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	49		49		57
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 8		$ 8		$ 12

Derivative Instruments (Details) - USD ($)	3 Months Ended	6 Months Ended
Derivative Instruments (Details) - USD ($)	Jun. 30, 2017	Jun. 30, 2017	Dec. 30, 2016	Aug. 31, 2016
Derivative [Line Items]
Effective portion recognized in other comprehensive income	$ (4,000,000)	$ (3,000,000)
Effective portion reclassified from accumulated other comprehensive income (loss) to earnings	0	1,000,000
Ineffective portion recognized in earnings	1,000,000	1,000,000
Gains expected to be reclassified in the next 12 months	3,000,000	3,000,000
Asset Derivatives \| Designated as Hedging Instrument
Derivative [Line Items]
Hedged instrument, face amount	1,150,000,000	1,150,000,000		$ 1,200,000,000
Stated interest rate (in percentage)				1.08%
Asset Derivatives \| Designated as Hedging Instrument \| Notes Which Mature In December 2020
Derivative [Line Items]
Hedged instrument, face amount	$ 450,000,000	$ 450,000,000
Stated interest rate (in percentage)	4.45%	4.45%
Asset Derivatives \| Other long-term liabilities \| Designated as Hedging Instrument \| Notes Which Mature In December 2020
Derivative [Line Items]
Hedged instrument, face amount	$ 450,000,000	$ 450,000,000
Stated interest rate (in percentage)	4.45%	4.45%
Fair Value Hedging \| Asset Derivatives \| Other assets \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative asset	$ 5,000,000	$ 5,000,000	$ 3,000,000
Cash Flow Hedging \| Asset Derivatives \| Other assets \| Designated as Hedging Instrument
Derivative [Line Items]
Derivative asset	$ 25,000,000	$ 25,000,000	$ 26,000,000

Debt (Summary of debt) (Detail) - USD ($)	Jun. 30, 2017	Feb. 28, 2017	Dec. 30, 2016
Debt Instrument [Line Items]
Capital leases due on various dates through fiscal 2020	$ 6,000,000		$ 3,000,000
Total long-term debt	3,231,000,000		3,287,000,000
Less: current portion	84,000,000		62,000,000
Total long-term debt, net of current portion	3,147,000,000		3,225,000,000
Notes Which Mature In December 2020
Debt Instrument [Line Items]
Senior secured notes:	$ 453,000,000		451,000,000
Stated interest rate (in percentage)	4.45%
Effective interest rate	4.53%
Notes Which Mature In December 2040
Debt Instrument [Line Items]
Senior secured notes:	$ 216,000,000		216,000,000
Stated interest rate (in percentage)	5.95%
Effective interest rate	6.03%
Term Loan A $400 million due August 2019
Debt Instrument [Line Items]
Senior secured term loans:	$ 89,000,000		123,000,000
Stated interest rate (in percentage)	3.06%
Effective interest rate	4.04%
Term Loan A $690 million due August 2021
Debt Instrument [Line Items]
Senior secured term loans:	$ 661,000,000		676,000,000
Stated interest rate (in percentage)	3.06%
Effective interest rate	3.63%
Term Loan A $310 million due August 2021
Debt Instrument [Line Items]
Senior secured term loans:	$ 297,000,000		304,000,000
Stated interest rate (in percentage)	3.06%
Effective interest rate	3.60%
Term Loan B $1,131 million due August 2023
Debt Instrument [Line Items]
Senior secured term loans:	$ 1,105,000,000		1,110,000,000
Stated interest rate (in percentage)	3.31%
Effective interest rate	3.67%
Notes Which Mature In July 2032
Debt Instrument [Line Items]
Senior unsecured notes:	$ 246,000,000		246,000,000
Stated interest rate (in percentage)	7.13%
Effective interest rate	7.43%
Notes Which Mature In July 2033
Debt Instrument [Line Items]
Senior unsecured notes:	$ 158,000,000		$ 158,000,000
Stated interest rate (in percentage)	5.50%
Effective interest rate	5.88%
Minimum \| Capital leases and other notes payable due on various dates through fiscal 2020
Debt Instrument [Line Items]
Stated interest rate (in percentage)	0.00%
Maximum \| Capital leases and other notes payable due on various dates through fiscal 2020
Debt Instrument [Line Items]
Stated interest rate (in percentage)	5.94%
Senior Notes \| Notes Which Mature In December 2020
Debt Instrument [Line Items]
Senior unsecured notes, face amount	$ 450,000,000
Senior Notes \| Notes Which Mature In December 2040
Debt Instrument [Line Items]
Senior unsecured notes, face amount	300,000,000
Secured Debt \| Term Loan A $400 million due August 2019
Debt Instrument [Line Items]
Senior unsecured notes, face amount	400,000,000
Secured Debt \| Term Loan A $690 million due August 2021
Debt Instrument [Line Items]
Senior unsecured notes, face amount	690,000,000
Secured Debt \| Term Loan A $310 million due August 2021
Debt Instrument [Line Items]
Senior unsecured notes, face amount	310,000,000
Secured Debt \| Term Loan B $1,131 million due August 2023
Debt Instrument [Line Items]
Senior unsecured notes, face amount	1,131,000,000	$ 1,100,000,000
Unsecured Debt \| Notes Which Mature In July 2032
Debt Instrument [Line Items]
Senior unsecured notes, face amount	250,000,000
Unsecured Debt \| Notes Which Mature In July 2033
Debt Instrument [Line Items]
Senior unsecured notes, face amount	$ 300,000,000

Debt (Senior Secured Notes and Senoir Secured Term Loans) (Detail) - USD ($)	1 Months Ended	3 Months Ended	6 Months Ended
	Feb. 28, 2017	Jun. 30, 2017	Jun. 30, 2017	Dec. 30, 2016
Debt Instrument [Line Items]
Long-term debt		$ 3,270,000,000	$ 3,270,000,000	$ 3,336,000,000
Unamortized discount		41,000,000	41,000,000	46,000,000
Debt issuance costs		9,000,000	9,000,000	9,000,000
Debt amortization expense		$ 3,000,000	$ 7,000,000
Notes Which Mature In December 2020
Debt Instrument [Line Items]
Stated interest rate (in percentage)		4.45%	4.45%
Term Loan B
Debt Instrument [Line Items]
Stated interest rate (in percentage)		3.31%	3.31%
Term Loan A $400 million due August 2019
Debt Instrument [Line Items]
Repayments of debt		$ 25,000,000
Stated interest rate (in percentage)		3.06%	3.06%
Secured Debt \| Term Loan B
Debt Instrument [Line Items]
Variable rate (in percentage)	2.25%
Note payable, face amount	$ 1,100,000,000	$ 1,131,000,000	$ 1,131,000,000
Debt instrument, decrease in basis points	50.00%
Secured Debt \| Term Loan A $400 million due August 2019
Debt Instrument [Line Items]
Note payable, face amount		$ 400,000,000	$ 400,000,000
London Interbank Offered Rate (LIBOR) \| Secured Debt \| Term Loan A
Debt Instrument [Line Items]
Variable rate (in percentage)		2.00%
Minimum \| London Interbank Offered Rate (LIBOR) \| Secured Debt \| Term Loan A
Debt Instrument [Line Items]
Variable rate (in percentage)			1.75%
Maximum \| London Interbank Offered Rate (LIBOR) \| Secured Debt \| Term Loan A
Debt Instrument [Line Items]
Variable rate (in percentage)			2.25%
Fair Value Hedging \| Designated as Hedging Instrument \| Asset Derivatives
Debt Instrument [Line Items]
Derivative asset		$ 5,000,000	$ 5,000,000	$ 3,000,000

Debt (Revolving Credit Facility) (Detail) - USD ($)	Jun. 30, 2017	Dec. 30, 2016
Debt Instrument [Line Items]
Amount outstanding	$ 0	$ 0
Line of Credit \| Revolving Credit Facility
Debt Instrument [Line Items]
Unsecured borrowing capacity	$ 750,000,000

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

Accumulated Other Comprehensive Income (Loss) (Schedule of Accumulated Other Comprehensive Loss) (Detail) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 30, 2016
AOCI, Net of Tax [Roll Forward]
Balance, value	$ 3,135
Other comprehensive income (loss)	14	$ 19
Taxes	(1)	(7)
Reclassification from accumulated other comprehensive income (loss)	(1)	(8)
Balance, value	3,224	3,135
Total accumulated other comprehensive income (loss)
AOCI, Net of Tax [Roll Forward]
Balance, value	(4)	(8)
Balance, value	8	(4)
Foreign currency translation adjustments
AOCI, Net of Tax [Roll Forward]
Balance, value	(7)	0
Other comprehensive income (loss)	15	(8)
Taxes	(2)	1
Reclassification from accumulated other comprehensive income (loss)	0	0
Balance, value	6	(7)
Unrecognized (loss) gain on derivative instruments
AOCI, Net of Tax [Roll Forward]
Balance, value	10	(4)
Other comprehensive income (loss)	(1)	26
Taxes	1	(10)
Reclassification from accumulated other comprehensive income (loss)	(1)	(2)
Balance, value	9	10
Pension liability adjustments
AOCI, Net of Tax [Roll Forward]
Balance, value	(7)	(4)
Other comprehensive income (loss)	0	1
Taxes	0	2
Reclassification from accumulated other comprehensive income (loss)	0	(6)
Balance, value	$ (7)	$ (7)

Earnings Per Share (EPS) (Reconciliation of Weighted Average Number of Shares Outstanding) (Detail) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Earnings Per Share [Abstract]
Basic weighted average number of shares outstanding (shares)	151	73	151	72
Dilutive common share equivalents-stock options and other stock awards (in shares)	2	1	2	2
Diluted weighted average number of shares outstanding (shares)	153	74	153	74

Earnings Per Share (EPS) (Schedule of Stock-Based Awards Excluded from Weighted Average Shares Outstanding) (Detail) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive stock based awards	1	1	1	1

Supplementary Cash Flow Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	$ 59	$ 43
Cash paid for income taxes, net of refunds	107	38
Non-cash financing activity:
Capital lease obligation	$ 6	$ 0

Business Segments (Schedule of Segment Reporting Information by Segment) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jul. 01, 2016	Jun. 30, 2017	Jul. 01, 2016
Segment Reporting Information [Line Items]
Revenues	$ 2,571	$ 1,288	$ 5,151	$ 2,600
Operating income (loss)	166	75	307	164
Operating Segments \| Defense Solutions
Segment Reporting Information [Line Items]
Revenues	1,243	785	2,537	1,565
Operating income (loss)	63	60	142	131
Operating Segments \| Civil
Segment Reporting Information [Line Items]
Revenues	875	300	1,717	661
Operating income (loss)	66	20	120	42
Operating Segments \| Health
Segment Reporting Information [Line Items]
Revenues	454	203	897	374
Operating income (loss)	74	18	121	34
Corporate expenses
Segment Reporting Information [Line Items]
Revenues	(1)	0	0	0
Operating income (loss)	$ (37)	$ (23)	$ (76)	$ (43)

Contingencies (Additional Information) (Detail)			1 Months Ended	3 Months Ended	6 Months Ended
Contingencies (Additional Information) (Detail)	Sep. 30, 2016 USD ($) patent	Feb. 03, 2016 USD ($) patent	Nov. 30, 2012 USD ($) patent	Apr. 30, 2012 LegalMatter executive	Jun. 30, 2017 USD ($)	Apr. 13, 2017 USD ($)	Dec. 30, 2016 USD ($)	Aug. 16, 2016 USD ($)	Nov. 10, 2015 USD ($)	Jul. 31, 2013 USD ($)
Legal Proceedings [Line Items]
Amount outstanding					$ 0		$ 0
Securities Class Actions
Legal Proceedings [Line Items]
Number of lawsuits \| LegalMatter				3
Number of lawsuits, withdrawn \| LegalMatter				1
Number of lawsuits, consolidated \| LegalMatter				2
Number of former Chief Executive Officers \| executive				2
Greek Government Contract
Legal Proceedings [Line Items]
Arbitral award						$ 63,000,000				$ 45,000,000
MSA Venture
Legal Proceedings [Line Items]
Estimate of possible loss								$ 64,000,000	$ 64,000,000
Contingency accrual					$ 39,000,000
Lockheed Martin \| MSA Venture
Legal Proceedings [Line Items]
Percentage of damages covered, between $38 million and $64 million (percentage)								100.00%
Percentage of damages covered, excess of $64 million settlement amount (percentage)								50.00%
Virnet X Inc
Legal Proceedings [Line Items]
Gain contingency, patents found infringed upon, number \| patent	4	4	2
Litigation settlement	$ 302,000,000	$ 626,000,000	$ 368,000,000
Leidos
Legal Proceedings [Line Items]
Litigation settlement, percentage of total (percentage)					25.00%
Leidos \| MSA Venture
Legal Proceedings [Line Items]
Estimate of possible loss								$ 38,000,000
Information Systems & Global Solutions Business of Lockheed Martin \| MSA Venture
Legal Proceedings [Line Items]
Indemnification asset					$ 1,000,000

Commitments (Additional Information) (Detail) $ in Millions	Jun. 30, 2017 USD ($)
Standby Letters of Credit
Other Commitments And Contingencies [Line Items]
Amount outstanding	$ 82
Performance Guarantee
Other Commitments And Contingencies [Line Items]
Surety bonds	$ 157