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Supplemental Financial Information - Accounts Payable (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Supplemental Financial Information - Accounts Payable [Abstract]    
Accounts payable trade $ 260 $ 263
Salaries payable 205 216
Taxes payable 269 220
Aircraft maintenance payable 74 69
Fuel payable 106 122
Other payable 416 526
Accounts Payable, Current $ 1,330 $ 1,416