Revenue - Air Traffic Liability - Loyalty Program Rollforward (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Change in Contract With Customer, Liability [Roll Forward] | ||||
| Beginning balance | $ 4,175 | $ 4,693 | $ 4,334 | $ 4,849 |
| Amounts deferred associated with points awarded | 722 | 649 | 2,079 | 2,214 |
| Ending balance | 4,128 | 4,505 | 4,128 | 4,505 |
| Passenger | ||||
| Change in Contract With Customer, Liability [Roll Forward] | ||||
| Revenue recognized from points redeemed | (734) | (805) | (2,188) | (2,475) |
| Other | ||||
| Change in Contract With Customer, Liability [Roll Forward] | ||||
| Revenue recognized from points redeemed | $ (35) | $ (32) | $ (97) | $ (83) |