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Revenue - Air Traffic Liability Rollforward (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022
Change in Contract With Customer, Liability [Roll Forward] |  |
Beginning balance | $ 8,250 | $ 7,725
Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty) | 12,369 | 11,086
Revenue from amounts included in contract liability opening balances | (4,170) | (3,029)
Revenue from current period sales | (7,390) | (7,264)
Ending balance | $ 9,059 | $ 8,518

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