Liabilities, Commitments and Contingencies - Schedule of 737 Max Customer Concessions and Other Considerations Liability (Details) - 737 Aircraft - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Customer Concession And Other Consideration Liability [Roll Forward] | ||
| Beginning balance – January 1 | $ 383 | $ 641 |
| Reductions for payments made | (53) | (135) |
| Reductions for concessions and other in-kind considerations | (66) | |
| Changes in estimates | (80) | (5) |
| Ending balance – September 30 | $ 250 | $ 435 |