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Supplemental Financial Information - Accounts Payable (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Supplemental Financial Information - Accounts Payable [Abstract] |  |
Accounts payable trade | $ 266 | $ 186
Salaries payable | 183 | 201
Taxes payable | 196 | 203
Aircraft maintenance payable | 65 | 38
Fuel payable | 108 | 123
Other payables | 406 | 569
Accounts Payable, Current | $ 1,224 | $ 1,320

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