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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 | 9 Months Ended
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Oct. 03, 2025 | Sep. 27, 2024 | Oct. 03, 2025 | Sep. 27, 2024
Accounting Policies [Abstract] |  |  |  |
Favorable impact | $ 52 | $ 58 | $ 147 | $ 125
Unfavorable impact | (32) | (28) | (89) | (107)
Net impact to income before income taxes | $ 20 | $ 30 | $ 58 | $ 18
Impact on diluted EPS attributable to Leidos common stockholders (in dollars per share) | $ 0.11 | $ 0.17 | $ 0.34 | $ 0.10

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