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Revenue - Air Traffic Liability Rollforward (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2022 | Jun. 30, 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) | 11,086 | 6,851
Revenue from amounts included in contract liability opening balances | (3,029) | (1,600)
Revenue from current period sales | (7,264) | 3,705
Ending balance | $ 8,518 | $ 8,679

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