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BUSINESS SEGMENT INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 27, 2025 | Jun. 28, 2024 | Jun. 27, 2025 | Jun. 28, 2024
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 5,426 | $ 5,299 | $ 10,558 | $ 10,510
CS | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 903 | 886 | 1,747 | 1,811
CS | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 456 | 438 | 952 | 793
CS | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,158 | 1,118 | 2,319 | 2,183
CS | Cost-type |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 201 | 206 | 380 | 421
CS | Intersegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (17) | (22) | (29) | (36)
CS | Operating segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,376 | 1,346 | 2,728 | 2,640
IMS | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,234 | 1,221 | 2,381 | 2,387
IMS | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 366 | 437 | 798 | 887
IMS | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,248 | 1,304 | 2,503 | 2,549
IMS | Cost-type |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 352 | 354 | 676 | 725
IMS | Intersegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (22) | (13) | (35) | (24)
IMS | Operating segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,622 | 1,671 | 3,214 | 3,298
SAS | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,567 | 1,488 | 2,943 | 2,995
SAS | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 207 | 206 | 425 | 435
SAS | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,195 | 1,072 | 2,189 | 2,180
SAS | Cost-type |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 579 | 622 | 1,179 | 1,250
SAS | Intersegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (13) | (13) | (30) | (28)
SAS | Operating segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,787 | 1,707 | 3,398 | 3,458
AR | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 597 | 613 | 1,206 | 1,177
AR | International |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 96 | 10 | 106 | 25
AR | Fixed-price |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 450 | 380 | 842 | 715
AR | Cost-type |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 243 | 243 | 470 | 487
AR | Intersegment |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | (5) | (10) | (15) | (15)
AR | Operating segments |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 698 | 633 | 1,327 | 1,217
Prime contractor | CS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,032 | 915 | 2,027 | 1,828
Prime contractor | IMS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,171 | 1,084 | 2,220 | 2,140
Prime contractor | SAS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 1,108 | 1,076 | 2,116 | 2,184
Prime contractor | AR |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 161 | 168 | 300 | 331
Subcontractor | CS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 327 | 409 | 672 | 776
Subcontractor | IMS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 429 | 574 | 959 | 1,134
Subcontractor | SAS |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | 666 | 618 | 1,252 | 1,246
Subcontractor | AR |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenue | $ 532 | $ 455 | $ 1,012 | $ 871

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