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Revenue - Air Traffic Liability Breakout (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Revenue Recognition and Deferred Revenue [Abstract] |  |  |  |
ATL - PAX Revenue and Ancillary PAX Services | $ 2,611 | $ 1,898 |  |
ATL - Loyalty Program | 2,919 | 2,667 |  |
Air Traffic Liability Total | $ 5,530 | $ 4,565 | $ 5,142 | $ 4,221

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- Definition Air Traffic Liability Loyalty Program + References No definition available. + Details
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- Definition Air Traffic Liability Passenger Revenue and Ancillary Passenger Services + References No definition available. + Details
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- Definition Air Traffic Liability Total + References No definition available. + Details
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- References No definition available. + Details
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