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Revenue - Air Traffic Liability Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023
Change in Contract With Customer, Liability [Roll Forward] |  |
Beginning balance | $ 8,279 | $ 8,250
Current period sales | 6,850 | 6,072
Revenue from amounts included in contract liability opening balances | (2,557) | (2,568)
Revenue from current period sales | (3,178) | (2,557)
Ending balance | $ 9,394 | $ 9,197

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