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Other Current Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 14 $ 24
Passenger and other taxes receivable 9 26
Income tax receivable 3 161
Other 14 15
Total other current assets $ 40 $ 226