CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (UNAUDITED) - USD ($) shares in Millions, $ in Millions	Total	Shares of common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss	Leidos Holdings, Inc. stockholders' equity	Non-controlling interest
Beginning balance (shares) at Dec. 28, 2018		146
Beginning Balance at Dec. 28, 2018	$ 3,311		$ 2,966	$ 372	$ (30)	$ 3,308	$ 3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	189			189		189
Other comprehensive loss, net of taxes	(5)				(5)	(5)
Issuances of stock (shares)		1
Issuances of stock	11		11			11
Repurchases of stock and other (shares)		(3)
Repurchases of stock and other	(222)		(222)			(222)
Dividends	(47)			(47)		(47)
Stock-based compensation	12		12			12
Ending balance (shares) at Mar. 29, 2019		144
Ending Balance at Mar. 29, 2019	3,297		2,767	562	(35)	3,294	3
Beginning balance (shares) at Jan. 03, 2020		141
Beginning Balance at Jan. 03, 2020	3,417		2,587	896	(70)	3,413	4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	115			115		115
Other comprehensive loss, net of taxes	(115)				(115)	(115)
Issuances of stock (shares)		1
Issuances of stock	9		9			9
Repurchases of stock and other	(32)		(32)			(32)
Dividends	(49)			(49)		(49)
Stock-based compensation	15		15			15
Ending balance (shares) at Apr. 03, 2020		142
Ending Balance at Apr. 03, 2020	$ 3,359		$ 2,579	$ 961	$ (185)	$ 3,355	$ 4