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BUSINESS SEGMENT INFORMATION - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 29, 2024 | Mar. 31, 2023
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 5,211 | $ 4,471
SAS | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,507 | 1,454
SAS | International |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 229 | 188
SAS | Fixed-price |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,108 | 1,022
SAS | Cost-reimbursable |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 628 | 620
SAS | Operating segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,751 | 1,655
SAS | Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | (15) | (13)
IMS | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,203 | 1,257
IMS | International |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 450 | 422
IMS | Fixed-price |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,278 | 1,286
IMS | Cost-reimbursable |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 375 | 393
IMS | Operating segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,669 | 1,700
IMS | Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | (16) | (21)
CS | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 925 | 791
CS | International |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 355 | 359
CS | Fixed-price |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,065 | 978
CS | Cost-reimbursable |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 215 | 172
CS | Operating segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,294 | 1,163
CS | Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | (14) | (13)
AR | United States |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 527 |
AR | International |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 15 |
AR | Fixed-price |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 302 |
AR | Cost-reimbursable |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 240 |
AR | Operating segments |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 542 |
AR | Intersegment |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 0 |
Prime contractor | SAS |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,108 | 1,010
Prime contractor | IMS |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 1,066 | 1,154
Prime contractor | CS |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 913 | 807
Prime contractor | AR |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 153 |
Subcontractor | SAS |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 628 | 632
Subcontractor | IMS |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 587 | 525
Subcontractor | CS |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | 367 | $ 343
Subcontractor | AR |  |
Disaggregation of Revenue [Line Items] |  |
Revenue | $ 389 |

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