CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2020	Jun. 28, 2019	Jul. 03, 2020	Jun. 28, 2019
Income Statement [Abstract]
Revenues	$ 2,914	$ 2,728	$ 5,803	$ 5,305
Cost of revenues	2,531	2,348	5,025	4,569
Selling, general and administrative expenses	195	175	383	341
Bad debt expense and recoveries	(81)	0	(72)	0
Acquisition, integration and restructuring costs	16	1	28	3
Asset impairment charges	11	0	11	0
Equity earnings of non-consolidated subsidiaries	(7)	(6)	(13)	(10)
Operating income	249	210	441	402
Non-operating (expense) income:
Interest expense, net	(41)	(33)	(89)	(71)
Other (expense) income, net	(16)	2	(30)	94
Income before income taxes	192	179	322	425
Income tax expense	(38)	(41)	(53)	(98)
Net income	154	138	269	327
Less: net income attributable to non-controlling interest	1	2	1	2
Net income attributable to Leidos common stockholders	$ 153	$ 136	$ 268	$ 325
Earnings per share:
Basic (dollars per share)	$ 1.08	$ 0.94	$ 1.89	$ 2.26
Diluted (dollars per share)	$ 1.06	$ 0.93	$ 1.86	$ 2.23