Revenue - Air Traffic Liability - Loyalty Program Rollforward (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Change in Contract With Customer, Liability [Roll Forward] | ||||
| Beginning balance | $ 4,278 | $ 4,841 | $ 4,334 | $ 4,849 |
| Amounts deferred associated with points awarded | 695 | 748 | 1,357 | 1,565 |
| Ending balance | 4,174 | 4,693 | 4,174 | 4,693 |
| Passenger Customer | ||||
| Change in Contract With Customer, Liability [Roll Forward] | ||||
| Revenue recognized from points redeemed | (766) | (870) | (1,454) | (1,670) |
| Other | ||||
| Change in Contract With Customer, Liability [Roll Forward] | ||||
| Revenue recognized from points redeemed | $ (33) | $ (26) | $ (63) | $ (51) |