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Revenue - Air Traffic Liability Rollforward (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Air Traffic Liability Roll Forward |  |  |
ATL, beginning balance |  | $ 4,565 | $ 4,221
Current Period Sales |  | 10,927 | 10,853
Revenue amounts in beginning balance | [1] | (2,613) | (2,370)
Revenue from Current Period Sales | [1] | (7,349) | (7,562)
ATL, ending balance |  | $ 5,530 | $ 5,142
[1] | (a) Does not include certain ancillary revenues that are purchased on the day of travel, which do not flow through Air traffic liability.

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- Definition Air Traffic Liability Total + References No definition available. + Details
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