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Supplemental Financial Information - Accounts Payable (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Accounts Payable [Abstract]    
Accounts payable trade $ 111 $ 304
Salaries payable 201 231
Taxes payable excluding income taxes 49 227
Aircraft maintenance payable 95 162
Fuel payable 66 129
Dividends payable 0 93
Other payable 409 428
Accounts payable $ 931 $ 1,574