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Supplemental Financial Information - Accounts Payable (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Supplemental Financial Information - Accounts Payable [Abstract]    
Accounts payable trade $ 181 $ 138
Salaries payable 203 200
Taxes payable 280 184
Aircraft maintenance payable 31 26
Fuel payable 57 95
Other payables 462 535
Accounts Payable, Current $ 1,214 $ 1,178