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Revenue - Air Traffic Liability Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
Change in Contract With Customer, Liability [Roll Forward] |  |
Beginning balance | $ 7,725 | $ 7,133
Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty) | 5,038 | 2,324
Revenue from amounts included in contract liability opening balances | (1,881) | (743)
Revenue from current period sales | (2,272) | 982
Ending balance | $ 8,610 | $ 7,732

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