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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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Jun. 28, 2024 | Jun. 30, 2023 | Jun. 28, 2024 | Jun. 30, 2023
Accounting Policies [Abstract] |  |  |  |
Favorable impact | $ 42 | $ 40 | $ 67 | $ 62
Unfavorable impact | (54) | (22) | (79) | (38)
Net impact to income before income taxes | $ (12) | $ 18 | $ (12) | $ 24
Impact on diluted EPS attributable to Leidos common stockholders (in dollars per share) | $ (0.07) | $ 0.10 | $ (0.06) | $ 0.13

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