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Revenue - Air Traffic Liability Rollforward (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Change in Contract With Customer, Liability [Roll Forward] |  |
Beginning balance | $ 8,279 | $ 8,250
Current period sales | 13,276 | 12,369
Revenue from amounts included in contract liability opening balances | (4,021) | (4,170)
Revenue from current period sales | (8,458) | (7,390)
Ending balance | $ 9,076 | $ 9,059

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