CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2020	Jun. 28, 2019	Jul. 03, 2020	Jun. 28, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 154	$ 138	$ 269	$ 327
Foreign currency translation adjustments	61	(12)	(13)	(2)
Unrecognized loss on derivative instruments	(3)	(26)	(45)	(41)
Pension adjustments	0	0	1	0
Total other comprehensive income (loss), net of taxes	58	(38)	(57)	(43)
Comprehensive income	212	100	212	284
Less: comprehensive income attributable to non-controlling interest	1	2	1	2
Comprehensive income attributable to Leidos common stockholders	$ 211	$ 98	$ 211	$ 282