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Revenues - Schedule of Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Apr. 03, 2026
Mar. 28, 2025
Apr. 03, 2026
Mar. 28, 2025
Disaggregation of Revenue [Line Items]        
Total revenues $ 3,478 $ 3,491 $ 6,715 $ 6,907
United States        
Disaggregation of Revenue [Line Items]        
Total revenues 2,708 2,585 5,198 5,070
International        
Disaggregation of Revenue [Line Items]        
Total revenues 770 906 1,517 1,837
Prime contractor        
Disaggregation of Revenue [Line Items]        
Total revenues 3,143 3,100 6,047 6,142
Subcontractor        
Disaggregation of Revenue [Line Items]        
Total revenues 335 391 668 765
Cost-plus-fee        
Disaggregation of Revenue [Line Items]        
Total revenues 1,987 2,249 3,832 4,415
Fixed-price        
Disaggregation of Revenue [Line Items]        
Total revenues 982 807 1,910 1,638
Time-and-materials        
Disaggregation of Revenue [Line Items]        
Total revenues 509 435 973 854
Department of War and U.S. Intelligence Community        
Disaggregation of Revenue [Line Items]        
Total revenues 1,881 1,808 3,617 3,576
Other U.S. Government Agencies        
Disaggregation of Revenue [Line Items]        
Total revenues 906 990 1,754 2,006
Commercial and International        
Disaggregation of Revenue [Line Items]        
Total revenues 691 693 1,344 1,325
DS        
Disaggregation of Revenue [Line Items]        
Total revenues 1,468 1,340 2,805 2,626
DS | United States        
Disaggregation of Revenue [Line Items]        
Total revenues 1,408 1,285 2,692 2,507
DS | International        
Disaggregation of Revenue [Line Items]        
Total revenues 60 55 113 119
DS | Prime contractor        
Disaggregation of Revenue [Line Items]        
Total revenues 1,381 1,215 2,640 2,379
DS | Subcontractor        
Disaggregation of Revenue [Line Items]        
Total revenues 87 125 165 247
DS | Cost-plus-fee        
Disaggregation of Revenue [Line Items]        
Total revenues 883 861 1,669 1,646
DS | Fixed-price        
Disaggregation of Revenue [Line Items]        
Total revenues 402 331 782 690
DS | Time-and-materials        
Disaggregation of Revenue [Line Items]        
Total revenues 183 148 354 290
DS | Department of War and U.S. Intelligence Community        
Disaggregation of Revenue [Line Items]        
Total revenues 816 738 1,527 1,460
DS | Other U.S. Government Agencies        
Disaggregation of Revenue [Line Items]        
Total revenues 421 405 821 821
DS | Commercial and International        
Disaggregation of Revenue [Line Items]        
Total revenues 231 197 457 345
GES        
Disaggregation of Revenue [Line Items]        
Total revenues 2,010 2,151 3,910 4,281
GES | United States        
Disaggregation of Revenue [Line Items]        
Total revenues 1,300 1,300 2,506 2,563
GES | International        
Disaggregation of Revenue [Line Items]        
Total revenues 710 851 1,404 1,718
GES | Prime contractor        
Disaggregation of Revenue [Line Items]        
Total revenues 1,762 1,885 3,407 3,763
GES | Subcontractor        
Disaggregation of Revenue [Line Items]        
Total revenues 248 266 503 518
GES | Cost-plus-fee        
Disaggregation of Revenue [Line Items]        
Total revenues 1,104 1,388 2,163 2,769
GES | Fixed-price        
Disaggregation of Revenue [Line Items]        
Total revenues 580 476 1,128 948
GES | Time-and-materials        
Disaggregation of Revenue [Line Items]        
Total revenues 326 287 619 564
GES | Department of War and U.S. Intelligence Community        
Disaggregation of Revenue [Line Items]        
Total revenues 1,065 1,070 2,090 2,116
GES | Other U.S. Government Agencies        
Disaggregation of Revenue [Line Items]        
Total revenues 485 585 933 1,185
GES | Commercial and International        
Disaggregation of Revenue [Line Items]        
Total revenues $ 460 $ 496 $ 887 $ 980