Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies (Narrative) (Details)

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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2020
Dec. 31, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Accrued expenses and other current liabilities $ 264,000,000   $ 258,000,000
Accrued expenses and other current liabilities 189,000,000   189,000,000
Cumulative-effect benefit to retained earnings 318,000,000   79,000,000
Deferred loyalty program revenue      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Loyalty program liability 118,000,000   109,000,000
Accrued expenses and other current liabilities 74,000,000   67,000,000
Accrued expenses and other current liabilities $ 44,000,000   $ 42,000,000
Cumulative adjustment, increase in loyalty revenues   $ 16,000,000  
Minimum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Historical collection attrition rate, period 7 years    
Maximum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Historical collection attrition rate, period 10 years