Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Cash flows from operating activities of continuing operations:
Net income	$ 164	$ 525	$ 59
Income from discontinued operations	(80)	(201)	(294)
Adjustments to reconcile net income to net cash provided by continuing operations:
Depreciation and amortization	81	92	88
Stock-based compensation	55	53	55
Intangible asset impairment charges	51	0	0
Bad debt expense	44	2	0
Restructuring charges, net	17	2	0
Net gain on sales and disposals of assets	(8)	(6)	(27)
Other	10	4	(1)
Increase (decrease) in cash and cash equivalents, net of effects of acquisitions and dispositions, resulting from changes in:
Receivables	(67)	228	(112)
Inventory, prepaid expenses and other current assets	55	(52)	(52)
Deferred income taxes	(38)	67	(8)
Other assets	19	(10)	(23)
Accounts payable and accrued liabilities	(88)	(695)	692
Accrued payroll and employee benefits	(65)	26	11
Income taxes receivable/payable	43	0	5
Other long-term liabilities	2	1	7
Total cash flows provided by operating activities of continuing operations	195	36	400
Cash flows from investing activities of continuing operations:
Expenditures for property, plant and equipment	(53)	(39)	(56)
Acquisitions of businesses, net of cash acquired	(3)	(483)	(218)
Net proceeds (payments) for purchase price adjustments related to prior year acquisitions	0	1	(4)
Proceeds from sale of assets	65	2	78
Net proceeds of cost method investments	12	0	2
Dividend received from the spin-off of New SAIC	295	0	0
Contribution paid related to the separation of New SAIC	(26)	0	0
Other	7	0	(1)
Total cash flows provided by (used in) investing activities of continuing operations	297	(519)	(199)
Cash flows from financing activities of continuing operations:
Payments on notes payable and long-term debt	(152)	(550)	(1)
Payments for deferred financing costs	(5)	0	0
Payment from New SAIC for deferred financing costs	5	0	0
Proceeds from real estate financing transaction	38	0	0
Proceeds from debt issuance	500	0	0
Distribution of debt to New SAIC	(500)	0	0
Sales of stock and exercises of stock options	13	19	27
Shares repurchased or retired or withheld for tax withholdings on vesting of restricted stock	(319)	(22)	(471)
Dividends payments	(477)	(165)	0
Other	3	0	(2)
Total cash flows used in financing activities of continuing operations	(894)	(718)	(447)
Decrease in cash and cash equivalents from continuing operations	(402)	(1,201)	(246)
Cash flows from discontinued operations:
Increase in cash and cash equivalents from discontinued operations	114	308	314
Cash provided by operating activities of discontinued operations	(17)	42	157
Cash used in financing activities of discontinued operations	0	(4)	(2)
Cash used in financing activities of discontinued operations	97	346	469
Effect of foreign currency exchange rate changes on cash and cash equivalents	0	0	1
Total (decrease) increase in cash and cash equivalents	(305)	(855)	224
Cash and cash equivalents at beginning of year	735	1,590	1,366
Cash and cash equivalents at end of year	430	735	1,590
Leidos, Inc.
Cash flows from operating activities of continuing operations:
Net income	166	526	56
Income from discontinued operations	(80)	(201)	(294)
Adjustments to reconcile net income to net cash provided by continuing operations:
Depreciation and amortization	81	92	88
Stock-based compensation	55	53	55
Intangible asset impairment charges	51	0	0
Bad debt expense	44	2	0
Restructuring charges, net	17	2	0
Net gain on sales and disposals of assets	(8)	(6)	(27)
Other	8	3	(1)
Increase (decrease) in cash and cash equivalents, net of effects of acquisitions and dispositions, resulting from changes in:
Receivables	(67)	228	(112)
Inventory, prepaid expenses and other current assets	55	(52)	(52)
Deferred income taxes	(38)	67	(8)
Other assets	19	(10)	(23)
Accounts payable and accrued liabilities	(88)	(695)	692
Accrued payroll and employee benefits	(65)	26	11
Income taxes receivable/payable	43	0	5
Other long-term liabilities	2	1	7
Total cash flows provided by operating activities of continuing operations	195	36	397
Cash flows from investing activities of continuing operations:
Proceeds from note payable to Leidos Holdings, Inc.	13
Payments on note payable to Leidos Holdings, Inc.	(501)
Expenditures for property, plant and equipment	(53)	(39)	(56)
Acquisitions of businesses, net of cash acquired	(3)	(483)	(218)
Net proceeds (payments) for purchase price adjustments related to prior year acquisitions	0	1	(4)
Proceeds from sale of assets	65	2	78
Net proceeds of cost method investments	12	0	2
Contribution paid related to the separation of New SAIC	(26)	0	0
Other	7	0	(1)
Total cash flows provided by (used in) investing activities of continuing operations	(486)	(519)	(199)
Cash flows from financing activities of continuing operations:
Proceeds from note with SAIC, Inc.		244	638
Payments on note with SAIC, Inc.		(411)	(1,079)
Payments on notes payable and long-term debt	(152)	(550)	(1)
Payments for deferred financing costs	(5)	0	0
Payment from New SAIC for deferred financing costs	5	0	0
Proceeds from real estate financing transaction	38	0	0
Dividends payments	0	(1)	0
Other	3	0	(2)
Total cash flows used in financing activities of continuing operations	(111)	(718)	(444)
Decrease in cash and cash equivalents from continuing operations	(402)	(1,201)	(246)
Cash flows from discontinued operations:
Increase in cash and cash equivalents from discontinued operations	114	308	314
Cash provided by operating activities of discontinued operations	(17)	42	157
Cash used in financing activities of discontinued operations	0	(4)	(2)
Cash used in financing activities of discontinued operations	97	346	469
Effect of foreign currency exchange rate changes on cash and cash equivalents	0	0	1
Total (decrease) increase in cash and cash equivalents	(305)	(855)	224
Cash and cash equivalents at beginning of year	735	1,590	1,366
Cash and cash equivalents at end of year	$ 430	$ 735	$ 1,590