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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. 04, 2025	Mar. 29, 2024
Accounting Policies [Abstract]
Favorable impact	$ 53	$ 25
Unfavorable impact	(23)	(25)
Net impact to income before income taxes	$ 30	$ 0
Impact on diluted EPS attributable to Leidos common stockholders (in dollars per share)	$ 0.17	$ 0

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