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Acquisitions Assets, Goodwill and Other (Schedule of Pro Forma Information) (Details) - Entrust - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Apr. 03, 2026	Apr. 04, 2025
Business Combination [Line Items]
Revenues	$ 4,528	$ 4,385
Net income	347	332
Net income attributable to Leidos common stockholders	$ 340	$ 330
Basic (in dollars per share)	$ 2.69	$ 2.54
Diluted (in dollars per share)	$ 2.65	$ 2.52

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