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Business Segments (Segment Reporting Information by Segment) (Details) - USD ($)
$ in Millions
 3 Months Ended
Apr. 04, 2025
Mar. 29, 2024
Segment Reporting Information [Line Items]    
Revenues $ 4,245 $ 3,975
Amortization of intangible assets 30 37
Corporate expense (3) 2
Total operating income 530 415
Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 4,245 3,975
Direct labor 959 916
Amortization of intangible assets 30 37
Other segment expense 2,701 2,570
Segment operating income 555 452
Corporate expense    
Segment Reporting Information [Line Items]    
Corporate expense 25 37
National Security & Digital | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 1,878 1,793
Direct labor 503 479
Amortization of intangible assets 5 6
Other segment expense 1,185 1,133
Segment operating income 185 175
Health & Civil | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 1,291 1,199
Direct labor 244 236
Amortization of intangible assets 6 6
Other segment expense 742 735
Segment operating income 299 222
Commercial & International | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 568 509
Direct labor 103 100
Amortization of intangible assets 7 8
Other segment expense 421 367
Segment operating income 37 34
Defense Systems | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 508 474
Direct labor 109 101
Amortization of intangible assets 12 17
Other segment expense 353 335
Segment operating income $ 34 $ 21