CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Millions, $ in Millions	Total	Shares of common stock	Additional paid-in capital	Accumulated earnings (deficit)	Accumulated other comprehensive (loss) income	Leidos Holdings, Inc. stockholders' equity	Non-controlling interest
Balance, shares at Dec. 30, 2016		150
Balance, value at Dec. 30, 2016	$ 3,147		$ 3,316	$ (177)	$ (4)	$ 3,135	$ 12
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	364			366		366	(2)
Other comprehensive loss, net of taxes	37				37	37
Issuances of stock (less forfeitures), shares		1
Issuances of stock (less forfeitures)	16		16			16
Repurchases of stock and other	(31)		(31)			(31)
Dividends	(196)			(196)		(196)
Stock-based compensation	43		43			43
Adjustment to original purchase price allocation	3						3
Balance, shares at Dec. 29, 2017		151
Balance, value at Dec. 29, 2017	3,383		3,344	(7)	33	3,370	13
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	582			581		581	1
Other comprehensive loss, net of taxes	(72)				(72)	(72)
Issuances of stock (less forfeitures), shares		1
Issuances of stock (less forfeitures)	17		17			17
Repurchases of stock and other, shares		(6)
Repurchases of stock and other	(438)		(438)			(438)
Dividends	(194)			(194)		(194)
Stock-based compensation	44		44			44
Purchase of a noncontrolling interest	(11)		(1)			(1)	(10)
Other	(1)						(1)
Balance, shares at Dec. 28, 2018		146
Balance, value at Dec. 28, 2018	3,311		2,966	372	(30)	3,308	3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	670			667		667	3
Other comprehensive loss, net of taxes	(40)				(40)	(40)
Issuances of stock (less forfeitures), shares		1
Issuances of stock (less forfeitures)	28		28			28
Repurchases of stock and other, shares		(6)
Repurchases of stock and other	(458)		(458)			(458)
Dividends	(191)			(191)		(191)
Stock-based compensation	52		52			52
Other	(3)		(1)			(1)	(2)
Balance, shares at Jan. 03, 2020		141
Balance, value at Jan. 03, 2020	$ 3,417		$ 2,587	$ 896	$ (70)	$ 3,413	$ 4