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Revenue Recognition - Loyalty Program Liability (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Frequent Flyer Liability Activity [Roll Forward] |  |
Mileage credits earned | $ 720 | $ 731
Travel mileage credits redeemed | (692) | (618)
Non-travel mileage credits redeemed | (45) | (40)
Loyalty program |  |
Frequent Flyer Liability Activity [Roll Forward] |  |
Deferred revenue (current and noncurrent), beginning | 6,641 | 6,321
Deferred revenue (current and noncurrent), ending | $ 6,624 | $ 6,394

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- Details
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