CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 163	$ 162	$ 432	$ 489
Foreign currency translation adjustments	26	(24)	13	(26)
Unrecognized gain (loss) on derivative instruments	4	(11)	(41)	(52)
Pension adjustments	(1)	0	0	0
Total other comprehensive income (loss), net of taxes	29	(35)	(28)	(78)
Comprehensive income	192	127	404	411
Less: comprehensive income attributable to non-controlling interest	0	1	1	3
Comprehensive income attributable to Leidos common stockholders	$ 192	$ 126	$ 403	$ 408