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Supplemental Financial Information - Accounts Payable (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Supplemental Financial Information - Accounts Payable [Abstract]    
Accounts payable trade $ 139 $ 304
Salaries payable 207 231
Taxes payable 38 227
Aircraft maintenance payable 129 162
Fuel payable 68 129
Dividends Payable 0 93
Other payable 389 428
Accounts Payable, Current $ 970 $ 1,574