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Supplemental Financial Information - Accounts Payable (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accounts Payable [Abstract]    
Accounts payable trade $ 304 $ 263
Salaries payable 231 216
Taxes payable excluding income taxes 227 220
Aircraft maintenance payable 162 69
Fuel payable 129 122
Other payable 521 526
Accounts payable $ 1,574 $ 1,416