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BUSINESS SEGMENTS - Disaggregation of Revenue (Details) $ in Millions | 12 Months Ended
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Dec. 29, 2023 USD ($) segment | Dec. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
Segment Reporting [Abstract] |  |  |
Number of operating segments | segment | 4 |  |
Number of reportable segments | segment | 4 |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 19,419 | $ 17,062 | $ 17,814
United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 17,537 | 15,373 | 16,234
International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,882 | 1,689 | 1,580
SAS | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 5,933 | 5,623 | 5,569
SAS | International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 874 | 712 | 704
SAS | Fixed-price |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 4,257 | 3,811 | 3,781
SAS | Cost-reimbursable |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 2,550 | 2,524 | 2,492
SAS | Prime contractor |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 4,252 | 4,005 | 3,942
SAS | Subcontractor |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 2,555 | 2,330 | 2,331
SAS | Intersegment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 49 | 49 | 42
SAS | Operating segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 6,856 | 6,384 | 6,315
IMS | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 4,816 | 4,796 | 4,782
IMS | International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,727 | 1,759 | 1,879
IMS | Fixed-price |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 5,020 | 5,060 | 5,231
IMS | Cost-reimbursable |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,523 | 1,495 | 1,430
IMS | Prime contractor |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 4,196 | 4,301 | 4,474
IMS | Subcontractor |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 2,347 | 2,254 | 2,187
IMS | Intersegment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 87 | 71 | 72
IMS | Operating segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 6,630 | 6,626 | 6,733
CS | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 3,482 | 2,735 | 3,001
CS | International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,535 | 1,437 | 1,232
CS | Fixed-price |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 4,289 | 3,552 | 3,631
CS | Cost-reimbursable |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 728 | 620 | 602
CS | Prime contractor |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 3,420 | 2,829 | 2,886
CS | Subcontractor |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,597 | 1,343 | 1,347
CS | Intersegment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 53 | 45 | 54
CS | Operating segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 5,070 | 4,217 | 4,287
AR | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 1,015 |  |
AR | International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 37 |  |
AR | Fixed-price |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 632 |  |
AR | Cost-reimbursable |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 420 |  |
AR | Prime contractor |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 250 |  |
AR | Subcontractor |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 802 |  |
AR | Intersegment |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | 0 |  |
AR | Operating segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenue | $ 1,052 | $ 0 | $ 0

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