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Supplemental Financial Information - Accounts Payable (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Accounts Payable [Abstract] |  |
Accounts payable trade | $ 138 | $ 178
Salaries payable | 200 | 173
Taxes payable | 184 | 179
Aircraft maintenance payable | 26 | 168
Fuel payable | 95 | 48
Other payable | 535 | 442
Accounts payable | $ 1,178 | $ 1,188

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