Condensed Consolidated Statements of Income (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Apr. 01, 2016
Income Statement [Abstract]
Revenues	$ 2,580	$ 1,312
Cost of revenues	2,270	1,154
Selling, general and administrative expenses	144	60
Acquisition and integration costs	19	9
Restructuring expenses	13	0
Equity earnings of non-consolidated subsidiaries	(7)	0
Operating income	141	89
Interest income	2	3
Interest expense	(38)	(14)
Other income, net	3	0
Income from continuing operations before income taxes	108	78
Income tax expense	(34)	(25)
Net income	74	53
Less: net income attributable to non-controlling interest, net of taxes	2	0
Net income attributable to Leidos common stockholders	$ 72	$ 53
Earnings per share:
Basic (dollar per share)	$ 0.48	$ 0.74
Diluted (dollar per share)	0.47	0.72
Cash dividends declared per share (dollars per share)	$ 0.32	$ 0.32