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Revenues (Disaggregated Revenue) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jan. 03, 2025 | Dec. 29, 2023 | Dec. 30, 2022
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 16,576 | $ 15,339 | $ 14,287
United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 15,206 | 14,015 | 13,098
International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,370 | 1,324 | 1,189
Cost-reimbursement and fixed-price-incentive-fee |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 7,305 | 7,341 | 7,113
Firm-fixed-price |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 7,054 | 5,964 | 5,402
Time-and-materials and fixed-price-level-of-effort |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,217 | 2,034 | 1,772
US DoD And US Intelligence Community |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 7,962 | 7,577 | 7,110
Other Government Agencies |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 6,488 | 5,734 | 5,240
Commercial and Non-US Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,126 | 2,028 | 1,937
National Security & Digital |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 7,304 | 7,142 | 6,701
National Security & Digital | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 7,274 | 7,105 | 6,661
National Security & Digital | International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 30 | 37 | 40
National Security & Digital | Cost-reimbursement and fixed-price-incentive-fee |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,870 | 3,808 | 3,618
National Security & Digital | Firm-fixed-price |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,023 | 2,040 | 2,031
National Security & Digital | Time-and-materials and fixed-price-level-of-effort |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,411 | 1,294 | 1,052
National Security & Digital | US DoD And US Intelligence Community |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 5,074 | 4,799 | 4,502
National Security & Digital | Other Government Agencies |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,115 | 2,212 | 2,034
National Security & Digital | Commercial and Non-US Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 115 | 131 | 165
Health & Civil |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 4,994 | 4,202 | 3,913
Health & Civil | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 4,989 | 4,197 | 3,911
Health & Civil | International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 5 | 5 | 2
Health & Civil | Cost-reimbursement and fixed-price-incentive-fee |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,787 | 2,015 | 2,047
Health & Civil | Firm-fixed-price |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,990 | 2,006 | 1,700
Health & Civil | Time-and-materials and fixed-price-level-of-effort |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 217 | 181 | 166
Health & Civil | US DoD And US Intelligence Community |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,032 | 1,059 | 1,047
Health & Civil | Other Government Agencies |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3,899 | 3,082 | 2,803
Health & Civil | Commercial and Non-US Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 63 | 61 | 63
Commercial & International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,248 | 2,116 | 1,866
Commercial & International | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 961 | 852 | 760
Commercial & International | International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,287 | 1,264 | 1,106
Commercial & International | Cost-reimbursement and fixed-price-incentive-fee |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 358 | 345 | 306
Commercial & International | Firm-fixed-price |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,454 | 1,351 | 1,181
Commercial & International | Time-and-materials and fixed-price-level-of-effort |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 436 | 420 | 379
Commercial & International | US DoD And US Intelligence Community |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 44 | 35 | 31
Commercial & International | Other Government Agencies |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 379 | 319 | 281
Commercial & International | Commercial and Non-US Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,825 | 1,762 | 1,554
Defense Systems |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 2,030 | 1,879 | 1,807
Defense Systems | United States |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,982 | 1,861 | 1,766
Defense Systems | International |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 48 | 18 | 41
Defense Systems | Cost-reimbursement and fixed-price-incentive-fee |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,290 | 1,173 | 1,142
Defense Systems | Firm-fixed-price |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 587 | 567 | 490
Defense Systems | Time-and-materials and fixed-price-level-of-effort |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 153 | 139 | 175
Defense Systems | US DoD And US Intelligence Community |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 1,812 | 1,684 | 1,530
Defense Systems | Other Government Agencies |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 95 | 121 | 122
Defense Systems | Commercial and Non-US Customers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 123 | $ 74 | $ 155

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