Consolidated Statements Of Cash Flows (USD $)	12 Months Ended
Jan. 30, 2015	Jan. 31, 2014	Jan. 31, 2013
Cash flows from operating activities of continuing operations:
Net (loss) income	$ (323,000,000)us-gaap_NetIncomeLoss	$ 164,000,000us-gaap_NetIncomeLoss	$ 525,000,000us-gaap_NetIncomeLoss
Income from discontinued operations	(7,000,000)	(80,000,000)	(202,000,000)
Adjustments to reconcile net (loss) income to net cash provided by continuing operations:
Depreciation and amortization	62,000,000	80,000,000	90,000,000
Stock-based compensation	42,000,000us-gaap_ShareBasedCompensation	55,000,000us-gaap_ShareBasedCompensation	53,000,000us-gaap_ShareBasedCompensation
Goodwill impairment charges	486,000,000us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Asset impairment charges	81,000,000us-gaap_AssetImpairmentCharges	51,000,000us-gaap_AssetImpairmentCharges	0us-gaap_AssetImpairmentCharges
Bad debt expense	5,000,000us-gaap_ProvisionForDoubtfulAccounts	44,000,000us-gaap_ProvisionForDoubtfulAccounts	2,000,000us-gaap_ProvisionForDoubtfulAccounts
Restructuring charges, net	3,000,000us-gaap_RestructuringCosts	17,000,000us-gaap_RestructuringCosts	2,000,000us-gaap_RestructuringCosts
Other	0us-gaap_OtherNoncashIncomeExpense	2,000,000us-gaap_OtherNoncashIncomeExpense	(2,000,000)us-gaap_OtherNoncashIncomeExpense
Change in assets and liabilities, net of effects of acquisitions and dispositions:
Receivables	162,000,000us-gaap_IncreaseDecreaseInReceivables	(69,000,000)us-gaap_IncreaseDecreaseInReceivables	218,000,000us-gaap_IncreaseDecreaseInReceivables
Inventory, prepaid expenses and other current assets	(12,000,000)	44,000,000	5,000,000
Deferred income taxes	56,000,000	(38,000,000)	67,000,000
Other assets	2,000,000	18,000,000	(9,000,000)
Accounts payable and accrued liabilities	(43,000,000)	(87,000,000)	(694,000,000)
Accrued payroll and employee benefits	(21,000,000)	(66,000,000)	27,000,000
Income taxes receivable/payable	(87,000,000)	54,000,000	(58,000,000)
Other long-term liabilities	(10,000,000)	2,000,000	0
Total cash flows provided by operating activities of continuing operations	396,000,000	191,000,000	24,000,000
Cash flows from investing activities of continuing operations:
Proceeds on obligations of Leidos Holdings, Inc.			0
Payments on obligations of Leidos Holdings, Inc.			0
Expenditures for property, plant and equipment	(29,000,000)	(53,000,000)	(39,000,000)
Acquisitions of businesses, net of cash acquired of $9 million in fiscal 2013	0	(3,000,000)	(483,000,000)
Net proceeds for purchase price adjustments related to prior year acquisitions	0	0	1,000,000
Proceeds from sale of assets	0	65,000,000	2,000,000
Proceeds from U.S. Treasury cash grant	80,000,000ldos_ProceedsfromGovernmentGrant	0ldos_ProceedsfromGovernmentGrant	0ldos_ProceedsfromGovernmentGrant
Net proceeds of cost method investments	0	12,000,000	0
Dividend received from the separation of New SAIC	0	295,000,000	0
Contribution paid related to the separation of New SAIC	0ldos_PaymentsforDivestitureofBusiness	(26,000,000)ldos_PaymentsforDivestitureofBusiness	0ldos_PaymentsforDivestitureofBusiness
Other	0	7,000,000	0
Total cash flows provided by (used in) investing activities of continuing operations	51,000,000	297,000,000	(519,000,000)
Cash flows from financing activities of continuing operations:
Payments on notes payable and long-term debt	(177,000,000)	(152,000,000)	(550,000,000)
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Proceeds from real estate financing transaction	0	38,000,000	0
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Distribution of debt to New SAIC	0ldos_TransferofDebtonSpinoff	(500,000,000)ldos_TransferofDebtonSpinoff	0ldos_TransferofDebtonSpinoff
Sales of stock and exercises of stock options	7,000,000	13,000,000	19,000,000
Repurchases of stock	(215,000,000)us-gaap_PaymentsForRepurchaseOfEquity	(319,000,000)us-gaap_PaymentsForRepurchaseOfEquity	(22,000,000)us-gaap_PaymentsForRepurchaseOfEquity
Dividend payments	(95,000,000)us-gaap_PaymentsOfDividends	(477,000,000)us-gaap_PaymentsOfDividends	(165,000,000)us-gaap_PaymentsOfDividends
Other	2,000,000	3,000,000	0
Total cash flows used in financing activities of continuing operations	(478,000,000)	(894,000,000)	(718,000,000)
Decrease in cash and cash equivalents from continuing operations	(31,000,000)	(406,000,000)	(1,213,000,000)
Cash flows from discontinued operations:
Increase in cash and cash equivalents from discontinued operations	15,000,000	118,000,000	320,000,000
Cash provided by operating activities of discontinued operations	29,000,000	(17,000,000)	42,000,000
Cash used in financing activities of discontinued operations	0	0	(4,000,000)
Cash used in financing activities of discontinued operations	44,000,000	101,000,000	358,000,000
Total increase (decrease) in cash and cash equivalents	13,000,000	(305,000,000)	(855,000,000)
Cash and cash equivalents at beginning of year	430,000,000	735,000,000	1,590,000,000
Cash and cash equivalents at end of year	443,000,000	430,000,000	735,000,000
Leidos, Inc.
Cash flows from operating activities of continuing operations:
Net (loss) income	(317,000,000)	166,000,000	526,000,000
Income from discontinued operations	(7,000,000)	(80,000,000)	(202,000,000)
Adjustments to reconcile net (loss) income to net cash provided by continuing operations:
Depreciation and amortization	62,000,000	80,000,000	90,000,000
Stock-based compensation	42,000,000	55,000,000	53,000,000
Goodwill impairment charges	486,000,000	0	0
Asset impairment charges	81,000,000	51,000,000	0
Bad debt expense	5,000,000	44,000,000	2,000,000
Restructuring charges, net	3,000,000	17,000,000	2,000,000
Other	(6,000,000)	0	(3,000,000)
Change in assets and liabilities, net of effects of acquisitions and dispositions:
Receivables	162,000,000	(69,000,000)	218,000,000
Inventory, prepaid expenses and other current assets	(12,000,000)	44,000,000	5,000,000
Deferred income taxes	56,000,000	(38,000,000)	67,000,000
Other assets	2,000,000	18,000,000	(9,000,000)
Accounts payable and accrued liabilities	(43,000,000)	(87,000,000)	(694,000,000)
Accrued payroll and employee benefits	(21,000,000)	(66,000,000)	27,000,000
Income taxes receivable/payable	(87,000,000)	54,000,000	(58,000,000)
Other long-term liabilities	(10,000,000)	2,000,000	0
Total cash flows provided by operating activities of continuing operations	396,000,000	191,000,000	24,000,000
Cash flows from investing activities of continuing operations:
Proceeds on obligations of Leidos Holdings, Inc.	156,000,000	13,000,000
Payments on obligations of Leidos Holdings, Inc.	(457,000,000)	(501,000,000)
Expenditures for property, plant and equipment	(29,000,000)	(53,000,000)	(39,000,000)
Acquisitions of businesses, net of cash acquired of $9 million in fiscal 2013	0	(3,000,000)	(483,000,000)
Net proceeds for purchase price adjustments related to prior year acquisitions	0	0	1,000,000
Proceeds from sale of assets	0	65,000,000	2,000,000
Proceeds from U.S. Treasury cash grant	80,000,000	0	0
Net proceeds of cost method investments	0	12,000,000	0
Contribution paid related to the separation of New SAIC	0	(26,000,000)	0
Other	0	7,000,000	0
Total cash flows provided by (used in) investing activities of continuing operations	(250,000,000)	(486,000,000)	(519,000,000)
Cash flows from financing activities of continuing operations:
Proceeds from note with SAIC, Inc.	0	0	244,000,000
Payments on note with SAIC, Inc.	0	0	(411,000,000)
Payments on notes payable and long-term debt	(177,000,000)	(152,000,000)	(550,000,000)
Payments for deferred financing costs	0	(5,000,000)	0
Payment from New SAIC for deferred financing costs	0	5,000,000	0
Proceeds from real estate financing transaction	0	38,000,000	0
Dividend payments	0	0	(1,000,000)
Other	0	3,000,000	0
Total cash flows used in financing activities of continuing operations	(177,000,000)	(111,000,000)	(718,000,000)
Decrease in cash and cash equivalents from continuing operations	(31,000,000)	(406,000,000)	(1,213,000,000)
Cash flows from discontinued operations:
Increase in cash and cash equivalents from discontinued operations	15,000,000	118,000,000	320,000,000
Cash provided by operating activities of discontinued operations	29,000,000	(17,000,000)	42,000,000
Cash used in financing activities of discontinued operations	0	0	(4,000,000)
Cash used in financing activities of discontinued operations	44,000,000	101,000,000	358,000,000
Total increase (decrease) in cash and cash equivalents	13,000,000	(305,000,000)	(855,000,000)
Cash and cash equivalents at beginning of year	430,000,000	735,000,000	1,590,000,000
Cash and cash equivalents at end of year	$ 443,000,000	$ 430,000,000	$ 735,000,000

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Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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