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Revenue - Roll Forward of Frequent Flyer Deferred Revenue (Details) - Frequent Flyer - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Frequent Flyer Deferred Revenue [Roll Forward] |  |  |  |
Total Frequent flyer deferred revenue - beginning balance | $ 6,495 | $ 6,185 | $ 6,282 | $ 5,975
Total miles awarded | 705 | 439 | 1,848 | 1,071
Travel miles redeemed | (601) | (391) | (1,489) | (781)
Non-travel miles redeemed | (21) | (16) | (63) | (48)
Total Frequent flyer deferred revenue - ending balance | $ 6,578 | $ 6,217 | $ 6,578 | $ 6,217

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