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Supplemental Financial Information - Accounts Payable (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Accounts Payable [Abstract]    
Accounts payable trade $ 263 $ 186
Salaries payable 216 201
Taxes payable 220 203
Aircraft maintenance payable 69 38
Fuel payable 122 123
Other payable 526 569
Accounts Payable, Current $ 1,416 $ 1,320