Revenue - Air Traffic Liability - Loyalty Program Rollforward (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
Sep. 30, 2025 |
Sep. 30, 2024 |
|
| Change in Contract With Customer, Liability [Roll Forward] | ||||
| Beginning balance | $ 4,693 | $ 4,962 | $ 4,849 | $ 4,916 |
| Amounts deferred associated with points awarded | 649 | 851 | 2,214 | 2,645 |
| Ending balance | 4,505 | 4,886 | 4,505 | 4,886 |
| Passenger Customer | ||||
| Change in Contract With Customer, Liability [Roll Forward] | ||||
| Revenue recognized from points redeemed | (805) | (896) | (2,475) | (2,589) |
| Other | ||||
| Change in Contract With Customer, Liability [Roll Forward] | ||||
| Revenue recognized from points redeemed | $ (32) | $ (31) | $ (83) | $ (86) |