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Revenue - Roll Forward of Frequent Flyer Deferred Revenue (Details) - Frequent Flyer - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Frequent Flyer Deferred Revenue [Roll Forward] |  |  |  |
Total Frequent flyer deferred revenue - beginning balance | $ 6,860 | $ 6,417 | $ 6,675 | $ 6,282
Total miles awarded | 902 | 666 | 1,649 | 1,143
Travel miles redeemed | (712) | (566) | (1,243) | (888)
Non-travel miles redeemed | (26) | (22) | (57) | (42)
Total Frequent flyer deferred revenue - ending balance | $ 7,024 | $ 6,495 | $ 7,024 | $ 6,495

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- Details
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