v3.24.1.u1
Revenues (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 29, 2024
Mar. 31, 2023
Disaggregation of Revenue [Line Items]    
Revenues $ 3,951 $ 3,679
United States    
Disaggregation of Revenue [Line Items]    
Revenues 3,635 3,366
International    
Disaggregation of Revenue [Line Items]    
Revenues 316 313
Cost-reimbursement and fixed-price-incentive-fee    
Disaggregation of Revenue [Line Items]    
Revenues 1,779 1,844
Firm-fixed-price    
Disaggregation of Revenue [Line Items]    
Revenues 1,640 1,333
Time-and-materials and fixed-price-level-of-effort    
Disaggregation of Revenue [Line Items]    
Revenues 532 502
National Security and Digital    
Disaggregation of Revenue [Line Items]    
Revenues 1,779 1,746
National Security and Digital | United States    
Disaggregation of Revenue [Line Items]    
Revenues 1,770 1,735
National Security and Digital | International    
Disaggregation of Revenue [Line Items]    
Revenues 9 11
National Security and Digital | Cost-reimbursement and fixed-price-incentive-fee    
Disaggregation of Revenue [Line Items]    
Revenues 946 927
National Security and Digital | Firm-fixed-price    
Disaggregation of Revenue [Line Items]    
Revenues 492 507
National Security and Digital | Time-and-materials and fixed-price-level-of-effort    
Disaggregation of Revenue [Line Items]    
Revenues 341 312
Health & Civil    
Disaggregation of Revenue [Line Items]    
Revenues 1,190 999
Health & Civil | United States    
Disaggregation of Revenue [Line Items]    
Revenues 1,189 998
Health & Civil | International    
Disaggregation of Revenue [Line Items]    
Revenues 1 1
Health & Civil | Cost-reimbursement and fixed-price-incentive-fee    
Disaggregation of Revenue [Line Items]    
Revenues 447 553
Health & Civil | Firm-fixed-price    
Disaggregation of Revenue [Line Items]    
Revenues 690 403
Health & Civil | Time-and-materials and fixed-price-level-of-effort    
Disaggregation of Revenue [Line Items]    
Revenues 53 43
Commercial & International    
Disaggregation of Revenue [Line Items]    
Revenues 508 489
Commercial & International | United States    
Disaggregation of Revenue [Line Items]    
Revenues 208 192
Commercial & International | International    
Disaggregation of Revenue [Line Items]    
Revenues 300 297
Commercial & International | Cost-reimbursement and fixed-price-incentive-fee    
Disaggregation of Revenue [Line Items]    
Revenues 85 92
Commercial & International | Firm-fixed-price    
Disaggregation of Revenue [Line Items]    
Revenues 319 289
Commercial & International | Time-and-materials and fixed-price-level-of-effort    
Disaggregation of Revenue [Line Items]    
Revenues 104 108
Defense Systems    
Disaggregation of Revenue [Line Items]    
Revenues 474 445
Defense Systems | United States    
Disaggregation of Revenue [Line Items]    
Revenues 468 441
Defense Systems | International    
Disaggregation of Revenue [Line Items]    
Revenues 6 4
Defense Systems | Cost-reimbursement and fixed-price-incentive-fee    
Disaggregation of Revenue [Line Items]    
Revenues 301 272
Defense Systems | Firm-fixed-price    
Disaggregation of Revenue [Line Items]    
Revenues 139 134
Defense Systems | Time-and-materials and fixed-price-level-of-effort    
Disaggregation of Revenue [Line Items]    
Revenues 34 39
DoD and U.S. Intelligence Community    
Disaggregation of Revenue [Line Items]    
Revenues 1,913 1,824
DoD and U.S. Intelligence Community | National Security and Digital    
Disaggregation of Revenue [Line Items]    
Revenues 1,221 1,154
DoD and U.S. Intelligence Community | Health & Civil    
Disaggregation of Revenue [Line Items]    
Revenues 257 272
DoD and U.S. Intelligence Community | Commercial & International    
Disaggregation of Revenue [Line Items]    
Revenues 10 8
DoD and U.S. Intelligence Community | Defense Systems    
Disaggregation of Revenue [Line Items]    
Revenues 425 390
Other U.S. government agencies    
Disaggregation of Revenue [Line Items]    
Revenues 1,537 1,365
Other U.S. government agencies | National Security and Digital    
Disaggregation of Revenue [Line Items]    
Revenues 525 557
Other U.S. government agencies | Health & Civil    
Disaggregation of Revenue [Line Items]    
Revenues 917 713
Other U.S. government agencies | Commercial & International    
Disaggregation of Revenue [Line Items]    
Revenues 73 65
Other U.S. government agencies | Defense Systems    
Disaggregation of Revenue [Line Items]    
Revenues 22 30
Commercial and non-U.S. customers    
Disaggregation of Revenue [Line Items]    
Revenues 501 490
Commercial and non-U.S. customers | National Security and Digital    
Disaggregation of Revenue [Line Items]    
Revenues 33 35
Commercial and non-U.S. customers | Health & Civil    
Disaggregation of Revenue [Line Items]    
Revenues 16 14
Commercial and non-U.S. customers | Commercial & International    
Disaggregation of Revenue [Line Items]    
Revenues 425 416
Commercial and non-U.S. customers | Defense Systems    
Disaggregation of Revenue [Line Items]    
Revenues $ 27 $ 25