CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
	Jan. 03, 2020	Dec. 28, 2018	Dec. 29, 2017
Income Statement [Abstract]
Revenues	$ 11,094	$ 10,194	$ 10,170
Cost of revenues	9,546	8,690	8,738
Selling, general and administrative expenses	689	729	737
Bad debt expense and recoveries	(40)	0	10
Acquisition, integration and restructuring costs	5	37	139
Asset impairment charges	0	7	0
Equity earnings of non-consolidated subsidiaries	(18)	(18)	(13)
Operating income	912	749	559
Non-operating expense:
Interest expense, net	(133)	(138)	(140)
Other income (expense), net	87	(1)	(26)
Income before income taxes	866	610	393
Income tax expense	(196)	(28)	(29)
Net income	670	582	364
Less: net income (loss) attributable to non-controlling interest	3	1	(2)
Net income attributable to Leidos common stockholders	$ 667	$ 581	$ 366
Earnings per share:
Basic (usd per share)	$ 4.66	$ 3.85	$ 2.41
Diluted (usd per share)	$ 4.60	$ 3.80	$ 2.38