v3.26.1
Revenues (Disaggregation of Revenue) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 03, 2026
Jul. 04, 2025
Jul. 03, 2026
Jul. 04, 2025
Disaggregation of Revenue [Line Items]        
Revenues $ 4,548 $ 4,233 $ 8,931 $ 8,461
United States        
Disaggregation of Revenue [Line Items]        
Revenues 4,144 3,893 8,170 7,774
International        
Disaggregation of Revenue [Line Items]        
Revenues 404 340 761 687
Cost-reimbursement and fixed-price-incentive-fee        
Disaggregation of Revenue [Line Items]        
Revenues 2,026 1,851 4,054 3,739
Firm-fixed-price        
Disaggregation of Revenue [Line Items]        
Revenues 1,862 1,827 3,645 3,596
Time-and-materials and fixed-price-level-of-effort        
Disaggregation of Revenue [Line Items]        
Revenues 660 555 1,232 1,126
Intelligence & Digital        
Disaggregation of Revenue [Line Items]        
Revenues 1,489 1,393 2,986 2,790
Intelligence & Digital | United States        
Disaggregation of Revenue [Line Items]        
Revenues 1,488 1,392 2,985 2,789
Intelligence & Digital | International        
Disaggregation of Revenue [Line Items]        
Revenues 1 1 1 1
Intelligence & Digital | Cost-reimbursement and fixed-price-incentive-fee        
Disaggregation of Revenue [Line Items]        
Revenues 904 793 1,808 1,588
Intelligence & Digital | Firm-fixed-price        
Disaggregation of Revenue [Line Items]        
Revenues 352 355 696 698
Intelligence & Digital | Time-and-materials and fixed-price-level-of-effort        
Disaggregation of Revenue [Line Items]        
Revenues 233 245 482 504
Health        
Disaggregation of Revenue [Line Items]        
Revenues 1,086 1,170 2,274 2,353
Health | United States        
Disaggregation of Revenue [Line Items]        
Revenues 1,086 1,170 2,274 2,353
Health | International        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
Health | Cost-reimbursement and fixed-price-incentive-fee        
Disaggregation of Revenue [Line Items]        
Revenues 388 374 816 781
Health | Firm-fixed-price        
Disaggregation of Revenue [Line Items]        
Revenues 665 761 1,395 1,496
Health | Time-and-materials and fixed-price-level-of-effort        
Disaggregation of Revenue [Line Items]        
Revenues 33 35 63 76
Homeland        
Disaggregation of Revenue [Line Items]        
Revenues 1,018 771 1,833 1,540
Homeland | United States        
Disaggregation of Revenue [Line Items]        
Revenues 626 445 1,092 878
Homeland | International        
Disaggregation of Revenue [Line Items]        
Revenues 392 326 741 662
Homeland | Cost-reimbursement and fixed-price-incentive-fee        
Disaggregation of Revenue [Line Items]        
Revenues 193 156 367 325
Homeland | Firm-fixed-price        
Disaggregation of Revenue [Line Items]        
Revenues 516 433 951 867
Homeland | Time-and-materials and fixed-price-level-of-effort        
Disaggregation of Revenue [Line Items]        
Revenues 309 182 515 348
Defense        
Disaggregation of Revenue [Line Items]        
Revenues 955 899 1,838 1,778
Defense | United States        
Disaggregation of Revenue [Line Items]        
Revenues 944 886 1,819 1,754
Defense | International        
Disaggregation of Revenue [Line Items]        
Revenues 11 13 19 24
Defense | Cost-reimbursement and fixed-price-incentive-fee        
Disaggregation of Revenue [Line Items]        
Revenues 541 528 1,063 1,045
Defense | Firm-fixed-price        
Disaggregation of Revenue [Line Items]        
Revenues 329 278 603 535
Defense | Time-and-materials and fixed-price-level-of-effort        
Disaggregation of Revenue [Line Items]        
Revenues 85 93 172 198
DoW and U.S. Intelligence Community        
Disaggregation of Revenue [Line Items]        
Revenues 2,236 2,065 4,405 4,124
DoW and U.S. Intelligence Community | Intelligence & Digital        
Disaggregation of Revenue [Line Items]        
Revenues 1,097 975 2,175 1,933
DoW and U.S. Intelligence Community | Health        
Disaggregation of Revenue [Line Items]        
Revenues 219 252 468 521
DoW and U.S. Intelligence Community | Homeland        
Disaggregation of Revenue [Line Items]        
Revenues 18 13 38 36
DoW and U.S. Intelligence Community | Defense        
Disaggregation of Revenue [Line Items]        
Revenues 902 825 1,724 1,634
Other U.S. government agencies        
Disaggregation of Revenue [Line Items]        
Revenues 1,548 1,624 3,174 3,260
Other U.S. government agencies | Intelligence & Digital        
Disaggregation of Revenue [Line Items]        
Revenues 379 408 782 837
Other U.S. government agencies | Health        
Disaggregation of Revenue [Line Items]        
Revenues 852 902 1,776 1,800
Other U.S. government agencies | Homeland        
Disaggregation of Revenue [Line Items]        
Revenues 298 280 570 555
Other U.S. government agencies | Defense        
Disaggregation of Revenue [Line Items]        
Revenues 19 34 46 68
Commercial and non-U.S. customers        
Disaggregation of Revenue [Line Items]        
Revenues 764 544 1,352 1,077
Commercial and non-U.S. customers | Intelligence & Digital        
Disaggregation of Revenue [Line Items]        
Revenues 13 10 29 20
Commercial and non-U.S. customers | Health        
Disaggregation of Revenue [Line Items]        
Revenues 15 16 30 32
Commercial and non-U.S. customers | Homeland        
Disaggregation of Revenue [Line Items]        
Revenues 702 478 1,225 949
Commercial and non-U.S. customers | Defense        
Disaggregation of Revenue [Line Items]        
Revenues $ 34 $ 40 $ 68 $ 76