CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (UNAUDITED) - USD ($) shares in Millions, $ in Millions	Total	Leidos Holdings, Inc. stockholders' equity	Shares of common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income	Non-controlling interest
Beginning balance (in shares) at Jan. 01, 2021			142
Beginning Balance at Jan. 01, 2021	$ 3,871	$ 3,862		$ 2,580	$ 1,328	$ (46)	$ 9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	205	205			205
Other comprehensive income, net of taxes	9	9				9
Issuances of stock	14	14		14
Repurchases of stock and other (in shares)			(1)
Repurchases of stock and other	(123)	(123)		(123)
Dividends	(49)	(49)			(49)
Stock-based compensation	15	15		15
Capital distributions to non-controlling interests	38						38
Ending balance (in shares) at Apr. 02, 2021			141
Ending Balance at Apr. 02, 2021	3,980	3,933		2,486	1,484	(37)	47
Beginning balance (in shares) at Dec. 31, 2021			140
Beginning Balance at Dec. 31, 2021	4,344	4,291		2,423	1,880	(12)	53
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	177	175			175		2
Other comprehensive income, net of taxes	32	32				32
Issuances of stock (shares)			1
Issuances of stock	15	15		15
Repurchases of stock and other (in shares)			(4)
Repurchases of stock and other	(526)	(526)		(526)
Dividends	(48)	(48)			(48)
Stock-based compensation	16	16		16
Capital distributions to non-controlling interests	(2)						(2)
Ending balance (in shares) at Apr. 01, 2022			137
Ending Balance at Apr. 01, 2022	$ 4,008	$ 3,955		$ 1,928	$ 2,007	$ 20	$ 53