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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
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