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OTHER - Contract Estimates (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 29, 2025 | Dec. 31, 2024 | Sep. 29, 2024 | Mar. 31, 2024 | Sep. 28, 2025 | Sep. 29, 2024
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Select program losses |  |  |  |  | $ 1,615 | $ 248
Contract liabilities |  | $ 9,795 |  |  | 10,259 |
TUHP |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Select program losses | $ 95 |  |  |  |  |
Cumulative losses on development |  |  |  |  | 130 |
Aeronautics | Classified Program |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Select program losses |  |  |  |  | 950 |
Favorable profit adjustments |  |  |  |  | 80 |
Reach-forward loss |  |  | $ 80 |  |  | 145
Contract liabilities |  |  |  |  | 530 |
Aeronautics | Classified Program | Initial Phase |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Reach-forward loss | 950 |  |  |  |  |
Cumulative losses on development |  |  |  |  | 1,800 |
Aeronautics | C-130 Programs |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Unfavorable profit adjustments |  |  |  |  | 105 |
Rotary and Mission Systems | CMHP |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Select program losses | $ 570 |  |  |  | 570 |
Cumulative losses on development |  |  |  |  | 670 |
Contract assets |  |  |  |  | 655 |
Rotary and Mission Systems | TUHP |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Select program losses |  |  |  |  | 95 |
Space | Commercial Civil Space Program |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Favorable profit adjustments |  |  |  |  | 130 |
Missiles and Fire Control | Classified Program |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Reach-forward loss |  | $ 1,310 |  | $ 100 |  | $ 100
Cumulative losses on development |  |  |  |  | 1,460 |
Contract liabilities |  |  |  |  | $ 1,250 |

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