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Business Segments (Segment Reporting Information by Segment) (Details) - USD ($)
$ in Millions
 3 Months Ended
Apr. 03, 2026
Apr. 04, 2025
Segment Reporting Information [Line Items]    
Revenues $ 4,400 $ 4,245
Amortization of intangible assets 30 30
Corporate expense (24) (3)
Total operating income 508 530
Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 4,400 4,245
Direct labor 1,002 959
Amortization of intangible assets 30 30
Other segment expense 2,843 2,701
Segment operating income 525 555
Corporate expense    
Segment Reporting Information [Line Items]    
Corporate expense 17 25
Intelligence & Digital | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 1,513 1,408
Direct labor 400 383
Amortization of intangible assets 8 5
Other segment expense 959 888
Segment operating income 146 132
Health | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 1,188 1,188
Direct labor 200 206
Amortization of intangible assets 4 6
Other segment expense 700 688
Segment operating income 284 288
Homeland | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 816 770
Direct labor 178 162
Amortization of intangible assets 7 7
Other segment expense 598 540
Segment operating income 33 61
Defense | Operating Segments    
Segment Reporting Information [Line Items]    
Revenues 883 879
Direct labor 224 208
Amortization of intangible assets 11 12
Other segment expense 586 585
Segment operating income $ 62 $ 74