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Supplemental Financial Information - Accounts Payable (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
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Supplemental Financial Information - Accounts Payable [Abstract] |  |
Accounts payable trade | $ 270 | $ 263
Salaries payable | 199 | 216
Taxes payable | 188 | 220
Aircraft maintenance payable | 109 | 69
Fuel payable | 120 | 122
Other payable | 388 | 526
Accounts Payable, Current | $ 1,274 | $ 1,416

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