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Revenues - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 27, 2024
Sep. 29, 2023
Sep. 30, 2022
Disaggregation of Revenue [Line Items]      
Total revenues $ 8,388 $ 7,865 $ 7,676
Department of Defense and U.S. Intelligence Community      
Disaggregation of Revenue [Line Items]      
Total revenues 5,603 5,265 5,384
Other U.S. Government Agencies      
Disaggregation of Revenue [Line Items]      
Total revenues 1,984 1,867 1,802
Commercial and International      
Disaggregation of Revenue [Line Items]      
Total revenues 801 733 490
United States      
Disaggregation of Revenue [Line Items]      
Total revenues 6,055 5,748 5,908
International      
Disaggregation of Revenue [Line Items]      
Total revenues 2,333 2,117 1,768
Prime contractor      
Disaggregation of Revenue [Line Items]      
Total revenues 7,510 6,958 6,879
Subcontractor      
Disaggregation of Revenue [Line Items]      
Total revenues 878 907 797
Cost-plus-fee      
Disaggregation of Revenue [Line Items]      
Total revenues 5,198 4,941 5,256
Fixed-price      
Disaggregation of Revenue [Line Items]      
Total revenues 2,226 2,089 1,777
Time-and-materials      
Disaggregation of Revenue [Line Items]      
Total revenues $ 964 $ 835 $ 643