Condensed Consolidated Statement of Stockholders' Equity (USD $) In Millions, except Share data, unless otherwise specified	Total USD ($)	Shares of Common stock	Additional paid-in capital USD ($)	Accumulated earnings (deficit) USD ($)	Accumulated other comprehensive loss USD ($)	Leidos, Inc. USD ($)	Leidos, Inc. Shares of Common stock	Leidos, Inc. Additional paid-in capital USD ($)	Leidos, Inc. Accumulated earnings (deficit) USD ($)	Leidos, Inc. Accumulated other comprehensive loss USD ($)
Balance, value at Jan. 31, 2014	$ 1,595		$ 1,576	$ 25	$ (6)	$ 2,732		$ 207	$ 2,531	$ (6)
Balance, shares at Jan. 31, 2014		80,000,000					5,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(367)			(367)		(362)			(362)
Other comprehensive income, net of tax	0					0
Issuances of stock, net of cancellations	9		9
Shares repurchased and retired or withheld for tax withholdings on vesting of restricted stock , shares		(6,000,000)
Shares repurchased and retired or withheld for tax withholdings on vesting of restricted stock, value	(213)		(176)	(37)
Dividends of $0.96 per share	(74)			(74)
Adjustments for income tax benefits (deficiency)from stock-based compensation	(5)		(5)
Stock-based compensation	33		33
Other	(2)		(2)
Balance, value at Oct. 31, 2014	976		1,435	(453)	(6)	2,370		207	2,169	(6)
Balance, shares at Oct. 31, 2014		74,000,000					5,000
Balance, value at Aug. 01, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	34					36
Other comprehensive income, net of tax	0					0
Balance, value at Oct. 31, 2014	$ 976				$ (6)	$ 2,370		$ 207		$ (6)
Balance, shares at Oct. 31, 2014							5,000