Quarterly report pursuant to Section 13 or 15(d)

Fair Value (Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Details)

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Fair Value (Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Inputs, Level 3 [Member] | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Vacation ownership contract receivables, net (Level 3) $ 2,319 $ 2,482
Fair Value, Inputs, Level 3 [Member] | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Vacation ownership contract receivables, net (Level 3) 2,811 3,035
Fair Value, Inputs, Level 2 [Member] | Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt (Level 2) 5,403 6,418
Fair Value, Inputs, Level 2 [Member] | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt (Level 2) $ 5,691 $ 6,705