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Supplemental Financial Information - Accounts Payable (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
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Supplemental Financial Information - Accounts Payable [Abstract] |  |
Accounts payable trade | $ 170 | $ 123
Salaries payable | 168 | 160
Tax withholdings payable | 234 | 163
Aircraft Maintenance Payable | 163 | 314
Fuel Payable | 68 | 85
Other payables | 331 | 358
Accounts Payable, Current | $ 1,134 | $ 1,203

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