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BUSINESS SEGMENT INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 27, 2024 | Sep. 29, 2023 | Sep. 27, 2024 | Sep. 29, 2023
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 5,292 | $ 4,915 | $ 15,802 | $ 14,079
Intersegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (40) | (49) | (149) | (142)
SAS | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,484 | 1,478 | 4,479 | 4,407
SAS | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 187 | 195 | 622 | 613
SAS | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,012 | 1,039 | 3,192 | 3,160
SAS | Cost-reimbursable |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 659 | 634 | 1,909 | 1,860
SAS | Operating segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,683 | 1,686 | 5,141 | 5,056
SAS | Intersegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (12) | (13) | (40) | (36)
IMS | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,217 | 1,141 | 3,683 | 3,679
IMS | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 443 | 406 | 1,330 | 1,258
IMS | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,258 | 1,164 | 3,876 | 3,767
IMS | Cost-reimbursable |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 402 | 383 | 1,137 | 1,170
IMS | Operating segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,671 | 1,568 | 5,069 | 5,003
IMS | Intersegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (11) | (21) | (56) | (66)
CS | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 975 | 874 | 2,786 | 2,499
CS | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 390 | 366 | 1,183 | 1,168
CS | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,146 | 1,047 | 3,329 | 3,127
CS | Cost-reimbursable |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 219 | 193 | 640 | 540
CS | Operating segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,382 | 1,255 | 4,022 | 3,707
CS | Intersegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (17) | (15) | (53) | (40)
AR | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 584 | 443 | 1,682 | 443
AR | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 12 | 12 | 37 | 12
AR | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 361 | 272 | 1,007 | 272
AR | Cost-reimbursable |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 235 | 183 | 712 | 183
AR | Operating segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 596 | 455 | 1,719 | 455
AR | Intersegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 0 | 0 | 0 | 0
Prime contractor | SAS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,008 | 1,081 | 3,192 | 3,175
Prime contractor | IMS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,051 | 962 | 3,214 | 3,243
Prime contractor | CS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 977 | 866 | 2,805 | 2,471
Prime contractor | AR |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 149 | 113 | 457 | 113
Subcontractor | SAS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 663 | 592 | 1,909 | 1,845
Subcontractor | IMS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 609 | 585 | 1,799 | 1,694
Subcontractor | CS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 388 | 374 | 1,164 | 1,196
Subcontractor | AR |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 447 | $ 342 | $ 1,262 | $ 342

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