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Supplemental Financial Information - Accounts Payable (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
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