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Supplemental Financial Information - Accounts and Other Receivables (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accounts and Other Receivables [Abstract]    
Trade receivables $ 46 $ 53
Credit card receivables 35 112
Business partners and other suppliers 274 779
Taxes receivable 740 [1] 87
Other 35 55
Accounts and other receivables 1,130 $ 1,086
Cash Tax Refund Expected From CARES Act Loss Carry Back Provision $ 470  
CARES Act Loss Carryback Period 5 years  
[1] This amount includes approximately $470 million associated with a significant cash tax refund expected as a result of the CARES Act allowing entities to carry back 2020 losses to prior periods of up to five years, and claim refunds of federal taxes paid. This amount also includes excise taxes remitted to taxing authorities for which the subsequent flights were canceled by Customers, resulting in amounts due back to the Company. See Note 15 for further information.