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Business Segments (Segment Reporting Information by Segment) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 04, 2025
Jun. 28, 2024
Jul. 04, 2025
Jun. 28, 2024
Segment Reporting Information [Line Items]        
Revenues $ 4,253 $ 4,132 $ 8,498 $ 8,107
Amortization of intangible assets 32 36 62 73
Corporate expense 2 2 (1) 4
Total operating income 571 475 1,101 890
Operating Segments        
Segment Reporting Information [Line Items]        
Revenues 4,253 4,132 8,498 8,107
Direct labor 938 942 1,897 1,857
Amortization of intangible assets 32 36 62 73
Other segment expense 2,703 2,641 5,404 5,212
Segment operating income 580 513 1,135 965
Corporate expense        
Segment Reporting Information [Line Items]        
Corporate expense 9 38 34 75
National Security & Digital | Operating Segments        
Segment Reporting Information [Line Items]        
Revenues 1,872 1,813 3,750 3,606
Direct labor 490 492 993 971
Amortization of intangible assets 7 5 12 11
Other segment expense 1,187 1,133 2,372 2,266
Segment operating income 188 183 373 358
Health & Civil | Operating Segments        
Segment Reporting Information [Line Items]        
Revenues 1,272 1,263 2,563 2,462
Direct labor 235 242 479 479
Amortization of intangible assets 6 7 12 13
Other segment expense 720 707 1,462 1,441
Segment operating income 311 307 610 529
Commercial & International | Operating Segments        
Segment Reporting Information [Line Items]        
Revenues 566 561 1,134 1,070
Direct labor 105 104 208 203
Amortization of intangible assets 7 7 14 15
Other segment expense 414 461 835 829
Segment operating income 40 (11) 77 23
Defense Systems | Operating Segments        
Segment Reporting Information [Line Items]        
Revenues 543 495 1,051 969
Direct labor 108 104 217 204
Amortization of intangible assets 12 17 24 34
Other segment expense 382 340 735 676
Segment operating income $ 41 $ 34 $ 75 $ 55