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Revenue - Air Traffic Liability Rollforward (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Change in Contract With Customer, Liability [Roll Forward] |  |
Beginning balance | $ 7,133 | $ 5,510
Current period sales (passenger travel, ancillary services, flight loyalty, and partner loyalty) | 6,851 | 5,946
Revenue from amounts included in contract liability opening balances | (1,600) | (1,936)
Revenue from current period sales | (3,705) | (2,641)
Ending balance | $ 8,679 | $ 6,879

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