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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		6 Months Ended
	Jul. 04, 2025	Jun. 28, 2024	Jul. 04, 2025	Jun. 28, 2024
Accounting Policies [Abstract]
Favorable impact	$ 42	$ 42	$ 95	$ 67
Unfavorable impact	(34)	(54)	(57)	(79)
Net impact to income before income taxes	$ 8	$ (12)	$ 38	$ (12)
Impact on diluted EPS attributable to Leidos common stockholders (in dollars per share)	$ 0.05	$ (0.07)	$ 0.22	$ (0.06)