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Supplemental Financial Information - Accounts Payable (Details) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015
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Supplemental Financial Information - Accounts Payable [Abstract] |  |
Accounts payable trade | $ 227 | $ 178
Salaries payable | 174 | 173
Taxes payable | 239 | 179
Aircraft maintenance payable | 128 | 168
Fuel payable | 54 | 48
Other payables | 425 | 442
Accounts Payable, Current | $ 1,247 | $ 1,188

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