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Basis of Presentation and Summary of Significant Accounting Policies (Changes in Estimates on Contracts) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Apr. 03, 2026	Apr. 04, 2025
Accounting Policies [Abstract]
Favorable impact	$ 37	$ 53
Unfavorable impact	(46)	(23)
Net impact to income before income taxes	$ (9)	$ 30
Impact on diluted EPS attributable to Leidos common stockholders (in dollars per share)	$ (0.05)	$ 0.17