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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 28, 2024
Accounting Policies [Abstract]  
Schedule of Changes in Estimates on Contracts
Changes in estimates on contracts were as follows:
Three Months EndedSix Months Ended
June 28,
2024
June 30,
2023
June 28,
2024
June 30,
2023
(in millions, except per share data)
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
$(0.07)$0.10 $(0.06)$0.13