CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019
Income Statement [Abstract]
Revenues	$ 3,242	$ 2,835	$ 9,045	$ 8,140
Cost of revenues	2,774	2,450	7,799	7,019
Selling, general and administrative expenses	200	177	583	518
Bad debt expense and recoveries	2	(35)	(70)	(35)
Acquisition, integration and restructuring costs	5	0	33	3
Asset impairment charges	0	0	11	0
Equity loss (earnings) of non-consolidated subsidiaries	3	(6)	(10)	(16)
Operating income	258	249	699	651
Non-operating (expense) income:
Interest expense, net	(44)	(28)	(133)	(99)
Other (expense) income, net	0	(7)	(30)	87
Income before income taxes	214	214	536	639
Income tax expense	(51)	(52)	(104)	(150)
Net income	163	162	432	489
Less: net income attributable to non-controlling interest	0	1	1	3
Net income attributable to Leidos common stockholders	$ 163	$ 161	$ 431	$ 486
Earnings per share:
Basic (dollars per share)	$ 1.15	$ 1.13	$ 3.04	$ 3.38
Diluted (dollars per share)	$ 1.13	$ 1.11	$ 2.99	$ 3.33