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Revenue (Disaggregation) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 04, 2025
Jun. 28, 2024
Jul. 04, 2025
Jun. 28, 2024
Disaggregation of Revenue [Line Items]        
Revenues $ 1,952 $ 1,847 $ 3,970 $ 3,665
United States        
Disaggregation of Revenue [Line Items]        
Revenues 1,110 950 2,219 1,895
Europe        
Disaggregation of Revenue [Line Items]        
Revenues 356 458 813 926
Middle East        
Disaggregation of Revenue [Line Items]        
Revenues 205 188 383 353
Australia        
Disaggregation of Revenue [Line Items]        
Revenues 137 136 269 257
Africa        
Disaggregation of Revenue [Line Items]        
Revenues 69 49 120 99
Asia        
Disaggregation of Revenue [Line Items]        
Revenues 37 25 81 56
Other countries        
Disaggregation of Revenue [Line Items]        
Revenues 38 41 85 79
U.S. Government Defense and Intelligence Clients        
Disaggregation of Revenue [Line Items]        
Revenues 856 769 1,762 1,527
U.S. Government Federal Civilian Clients        
Disaggregation of Revenue [Line Items]        
Revenues 273 268 554 548
International Government Clients        
Disaggregation of Revenue [Line Items]        
Revenues 223 219 442 440
Commercial and Infrastructure Clients        
Disaggregation of Revenue [Line Items]        
Revenues 600 591 1,212 1,150
MTS        
Disaggregation of Revenue [Line Items]        
Revenues 1,412 1,316 2,880 2,641
MTS | United States        
Disaggregation of Revenue [Line Items]        
Revenues 988 821 1,964 1,639
MTS | Europe        
Disaggregation of Revenue [Line Items]        
Revenues 290 387 670 783
MTS | Middle East        
Disaggregation of Revenue [Line Items]        
Revenues 39 23 65 53
MTS | Australia        
Disaggregation of Revenue [Line Items]        
Revenues 56 50 106 97
MTS | Africa        
Disaggregation of Revenue [Line Items]        
Revenues 18 16 36 33
MTS | Asia        
Disaggregation of Revenue [Line Items]        
Revenues 10 2 13 6
MTS | Other countries        
Disaggregation of Revenue [Line Items]        
Revenues 11 17 26 30
MTS | U.S. Government Defense and Intelligence Clients        
Disaggregation of Revenue [Line Items]        
Revenues 856 769 1,762 1,527
MTS | U.S. Government Federal Civilian Clients        
Disaggregation of Revenue [Line Items]        
Revenues 273 268 554 548
MTS | International Government Clients        
Disaggregation of Revenue [Line Items]        
Revenues 223 219 442 440
MTS | Commercial and Infrastructure Clients        
Disaggregation of Revenue [Line Items]        
Revenues 60 60 122 126
STS        
Disaggregation of Revenue [Line Items]        
Revenues 540 531 1,090 1,024
STS | United States        
Disaggregation of Revenue [Line Items]        
Revenues 122 129 255 256
STS | Europe        
Disaggregation of Revenue [Line Items]        
Revenues 66 71 143 143
STS | Middle East        
Disaggregation of Revenue [Line Items]        
Revenues 166 165 318 300
STS | Australia        
Disaggregation of Revenue [Line Items]        
Revenues 81 86 163 160
STS | Africa        
Disaggregation of Revenue [Line Items]        
Revenues 51 33 84 66
STS | Asia        
Disaggregation of Revenue [Line Items]        
Revenues 27 23 68 50
STS | Other countries        
Disaggregation of Revenue [Line Items]        
Revenues 27 24 59 49
STS | U.S. Government Defense and Intelligence Clients        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
STS | U.S. Government Federal Civilian Clients        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
STS | International Government Clients        
Disaggregation of Revenue [Line Items]        
Revenues 0 0 0 0
STS | Commercial and Infrastructure Clients        
Disaggregation of Revenue [Line Items]        
Revenues 540 531 1,090 1,024
Science & Space | MTS        
Disaggregation of Revenue [Line Items]        
Revenues 289 291 585 589
Defense & Intel | MTS        
Disaggregation of Revenue [Line Items]        
Revenues 785 651 1,604 1,322
Readiness & Sustainment | MTS        
Disaggregation of Revenue [Line Items]        
Revenues $ 338 $ 374 $ 691 $ 730