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Liabilities, Commitments and Contingencies - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 USD ($) aircraft lot | Sep. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) aircraft | Sep. 30, 2018 USD ($) aircraft | Sep. 30, 2025 USD ($) aircraft lot | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) aircraft | Jun. 30, 2025 aircraft | Dec. 31, 2018 USD ($) aircraft simulator | Dec. 31, 2011 lot tanker aircraft
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Environmental loss contingency, operation and maintenance period, maximum |  |  |  |  | 30 years |  |  |  |  |
Loss contingency, range of possible loss, portion not accrued | $ 1,175 |  |  |  | $ 1,175 |  | $ 1,002 |  |  |
Contingent liabilities on outstanding letters of credit agreements and surety bonds | 2,864 |  |  |  | 2,864 |  | 2,991 |  |  |
Supplier finance program, obligation | 1,919 |  |  |  | 1,919 |  | 2,703 |  |  |
Increase (decrease) in earnings from operations due to change in accounting estimate | (206) | $ (2,622) |  |  | (544) | $ (4,322) |  |  |  |
Number of annual production lot | lot |  |  |  |  |  |  |  |  |  | 13
VC-25B |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Contract value | $ 4,000 |  |  |  | $ 4,000 |  |  |  |  |
Number of commercial aircraft | aircraft | 2 |  |  |  | 2 |  |  |  |  |
Increase (decrease) in earnings from operations due to change in accounting estimate |  |  |  |  |  |  | (379) |  |  |
KC-46A Tanker |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Contract value | $ 29,000 |  |  |  | $ 29,000 |  |  |  |  |
Increase (decrease) in earnings from operations due to change in accounting estimate |  |  |  |  | $ (149) |  | (2,002) |  |  |
Number of generation aerial refueling tanker | tanker |  |  |  |  |  |  |  |  |  | 4
Number of aircraft | aircraft | 154 |  |  |  | 154 |  |  |  |  | 179
Number of low rate initial production lot | lot | 11 |  |  |  | 11 |  |  |  |  |
MQ-25 |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Contract value |  |  |  | $ 890 |  |  |  |  |  |
Increase (decrease) in earnings from operations due to change in accounting estimate |  |  |  | $ (291) |  |  | $ (339) |  |  |
Number of aircraft | aircraft |  |  |  | 7 |  |  |  |  |  |
Cost-type contract modification, awarded amount |  |  | $ 657 |  |  |  |  |  |  |
Number of additional test aircraft | aircraft |  |  | 2 |  |  |  |  |  |  |
T-7A EMD |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Contract value |  |  |  |  |  |  |  |  | $ 860 |
Number of aircraft | aircraft |  |  |  |  |  |  | 5 | 4 | 5 |
Number of simulator | simulator |  |  |  |  |  |  |  |  | 7 |
T-7A EMD and Production |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in earnings from operations due to change in accounting estimate |  |  |  |  |  |  | $ (1,770) |  |  |
T-7A Production |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of aircraft | aircraft |  |  |  |  |  |  |  | 342 |  |
Commercial Crew |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in earnings from operations due to change in accounting estimate |  |  |  |  |  |  | (523) |  |  |
Minimum | Supplier Finance Program, Majority of Amounts Payable |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Supplier finance program, payment timing, period | 30 days |  |  |  | 30 days |  |  |  |  |
Maximum | Supplier Finance Program, Majority of Amounts Payable |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Supplier finance program, payment timing, period | 90 days |  |  |  | 90 days |  |  |  |  |
Commercial Aircraft Commitments | Total Contractual Trade-In Commitment |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Other commitment | $ 1,332 |  |  |  | $ 1,332 |  | 1,393 |  |  |
Commercial Aircraft Commitments | Net Amounts Payable to Customers Related to Probable Contractual Trade-In Commitments |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Other commitment | 67 |  |  |  | 67 |  | 275 |  |  |
Commercial Aircraft Commitments | Fair Value of Trade in Value of Aircraft |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Other commitment | 63 |  |  |  | 63 |  | 270 |  |  |
Financing Commitment |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Other commitment | 15,460 |  |  |  | 15,460 |  | $ 17,124 |  |  |
Financing Commitment | External Credit Rating, Non Investment Grade |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Other commitment | 12,131 |  |  |  | 12,131 |  |  |  |  |
Joint Venture |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Other commitment | $ 269 |  |  |  | $ 269 |  |  |  |  |
Other commitment, period | 7 years |  |  |  | 7 years |  |  |  |  |
2023 |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Changes in estimates |  |  |  |  | $ 55 |  |  |  |  |
Contingent on Customer Negotiations |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
737 MAX customer concessions and other considerations liability | $ 87 |  |  |  | 87 |  |  |  |  |
Alaska Airlines 737-9 Accident and 737-9 Grounding |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Revenue from contract with customer, excluding assessed tax |  |  | $ 443 |  |  |  |  |  |  |
Capitalized Precontract Costs | KC-46A Tanker |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Capitalized precontract costs | 99 |  |  |  | 99 |  |  |  |  |
Capitalized Precontract Costs | T-7A Production |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Capitalized precontract costs | 333 |  |  |  | 333 |  |  |  |  |
Capitalized Precontract Costs | Commercial Crew |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Capitalized precontract costs | 407 |  |  |  | 407 |  |  |  |  |
Potential Termination Liabilities | KC-46A Tanker |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Capitalized precontract costs | 170 |  |  |  | 170 |  |  |  |  |
Potential Termination Liabilities | T-7A Production |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Capitalized precontract costs | 849 |  |  |  | 849 |  |  |  |  |
Potential Termination Liabilities | Commercial Crew |  |  |  |  |  |  |  |  |  |
Commitments And Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |
Capitalized precontract costs | $ 141 |  |  |  | $ 141 |  |  |  |  |

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