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Supplemental Financial Information - Accounts Payable (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Supplemental Financial Information - Accounts Payable [Abstract]    
Accounts payable trade $ 256 $ 263
Salaries payable 213 216
Taxes payable 291 220
Aircraft maintenance payable 67 69
Fuel payable 119 122
Other payable 466 526
Accounts Payable, Current $ 1,412 $ 1,416