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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
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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)

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