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Supplemental Financial Information - Accounts Payable (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Supplemental Financial Information - Accounts Payable [Abstract]    
Accounts payable trade $ 169 $ 111
Salaries payable 197 201
Taxes payable 190 49
Aircraft maintenance payable 83 95
Fuel payable 98 66
Other payable 357 409
Accounts Payable, Current $ 1,094 $ 931