Quarterly report pursuant to Section 13 or 15(d)

Transactions with Former Parent and Former Subsidiaries (Narrative) (Details)

v3.21.2
Transactions with Former Parent and Former Subsidiaries (Narrative) (Details)
£ in Millions, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
GBP (£)
Dec. 31, 2019
USD ($)
British Travel Association and Regulatory Authorities            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Secured bonding facility and perpetual guarantee   $ 46        
Guarantee, fair value   22        
Sale Of European Vacation Rental Business | Financial Guarantee | British Travel Association and Regulatory Authorities            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability   80     £ 58  
Sale Of European Vacation Rental Business | Letter of Credit [Member] | British Travel Association and Regulatory Authorities            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability   49     £ 36  
Accrued Expenses and Other Liabilities | Sale Of European Vacation Rental Business | European vacation rentals business            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Guarantee, fair value   $ 90        
Affiliated Entity            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Responsible liability for separation agreement   37.50%        
Contingent and other corporate liabilities retained   0.25        
Related Party Transaction, Expenses from Transactions with Related Party   $ 0 $ 1      
Separation and Distribution Agreement, Portion of Certain Contingent and Other Corporate Liabilities Assumed   0.67        
Separation and Distribution Agreement, Portion of Proceeds From Contingent and Other Corporate Assets   0.67        
Post-closing Credit Support, Portion of Escrow Received Upon Release   0.67        
Post-closing Credit Support, Portion of Guarantees Assumed   0.67        
Affiliated Entity | Sale Of European Vacation Rental Business | Financial Guarantee | Awaze Limited [Member]            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Secured bonding facility and perpetual guarantee           $ 44
Affiliated Entity | Sale Of European Vacation Rental Business | Indemnification Agreement            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Guarantee, fair value   $ 42        
Affiliated Entity | Sale Of North American Vacation Rental Business [Member] | Indemnification Agreement            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Guarantee, fair value   2        
Affiliated Entity | General and Administrative Expense [Member] | Sale Of European Vacation Rental Business            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Related Party Transaction, Expenses from Transactions with Related Party $ 1   1      
Affiliated Entity | General and Administrative Expense [Member] | Sale Of North American Vacation Rental Business [Member]            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Related Party Transaction, Expenses from Transactions with Related Party 1 1 1      
Affiliated Entity | Net Revenue [Member] | Sale Of European Vacation Rental Business            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Revenue from Related Parties 1   1      
Affiliated Entity | Other Revenue [Member] | Sale Of North American Vacation Rental Business [Member]            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Revenue from Related Parties $ 1 1 1      
Affiliated Entity | Cendant | Accrued Expenses and Other Liabilities            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Liabilities assumed   13   $ 13    
Tax liabilities assumed   12        
Other contingent and corporate liabilities assumed   $ 1        
Affiliated Entity | Realogy            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Responsible liability for separation agreement   62.50%        
Affiliated Entity | Wyndham Hotels And Resorts, Inc. [Member]            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Contingent and other corporate liabilities retained   0.33        
Separation and Distribution Agreement, Portion of Certain Contingent and Other Corporate Liabilities Assumed   0.33        
Separation and Distribution Agreement, Portion of Proceeds From Contingent and Other Corporate Assets   0.33        
Post-closing Credit Support, Portion of Escrow Received Upon Release   0.33        
Wyndham Hotels And Resorts, Inc. [Member]            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Receivable from related party   $ 7        
Wyndham Hotels And Resorts, Inc. [Member] | Sale Of European Vacation Rental Business | Financial Guarantee | British Travel Association and Regulatory Authorities            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Secured bonding facility and perpetual guarantee   81        
Guarantee, fair value   39        
Wyndham Hotels And Resorts, Inc. [Member] | Sale Of European Vacation Rental Business | Indemnification Agreement            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Receivable from related party   14        
Wyndham Hotels And Resorts, Inc. [Member] | General and Administrative Expense [Member] | Transaction Service Agreement [Member]            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Related Party Transaction, Expenses from Transactions with Related Party     $ 1      
Wyndham Hotels And Resorts, Inc. [Member] | Other Assets | Sale Of European Vacation Rental Business            
Separation Adjustments And Transactions With Former Parent And Subsidiaries [Line Items]            
Receivable from related party   $ 21