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Revenue - Air Traffic Liability Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 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) | 6,072 | 5,038
Revenue from amounts included in contract liability opening balances | (2,568) | (1,881)
Revenue from current period sales | (2,557) | (2,272)
Ending balance | $ 9,197 | $ 8,610

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