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Supplemental Financial Information - Accounts Payable (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Supplemental Financial Information - Accounts Payable [Abstract]    
Accounts payable trade $ 218 $ 304
Salaries payable 226 231
Taxes payable 66 227
Aircraft maintenance payable 156 162
Fuel payable 57 129
Dividends Payable 0 93
Other payable 320 428
Accounts Payable, Current $ 1,043 $ 1,574