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Revenue - Air Traffic Liability - Loyalty Program Rollforward (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Change in Contract With Customer, Liability [Roll Forward] |  |  |  |
Beginning balance | $ 4,623 | $ 3,561 | $ 4,447 | $ 3,385
Amounts deferred associated with points awarded | 656 | 385 | 1,121 | 1,041
Ending balance | 4,719 | 3,856 | 4,719 | 3,856
Passenger Customer |  |  |  |
Change in Contract With Customer, Liability [Roll Forward] |  |  |  |
Revenue recognized from points redeemed | (549) | (81) | (826) | (542)
Other |  |  |  |
Change in Contract With Customer, Liability [Roll Forward] |  |  |  |
Revenue recognized from points redeemed | $ (11) | $ (9) | $ (23) | $ (28)

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- Definition Contract With Customer Liability, Air Traffic Liability, Loyalty Program + References No definition available. + Details
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- Definition Contract With Customer Liability, Air Traffic Liability, Loyalty Program, Awarded Points + References No definition available. + Details
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- Definition Contract With Customer, Liability, Loyalty Program, Revenue Recognized + References No definition available. + Details
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- Details
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- Details
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