Quarterly report pursuant to Section 13 or 15(d)

Transactions With Former Parent (Narrative) (Details)

v3.21.2
Transactions With Former Parent (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2020
Other non-current liabilities            
Related Party Transaction [Line Items]            
Separation and distribution agreement, contingent liability assumed, remaining amount $ 18   $ 18     $ 18
Other Current Liabilities            
Related Party Transaction [Line Items]            
Separation and distribution agreement, contingent liability assumed, remaining amount 4   4     3
Other Current Assets            
Related Party Transaction [Line Items]            
Receivables due from former parent 2   2     $ 4
Wyndham Worldwide | Licensing Agreements            
Related Party Transaction [Line Items]            
Revenue from former parent 17 $ 16 32 $ 32    
Affiliated Entity | Licensing Agreements            
Related Party Transaction [Line Items]            
Revenue from former parent 1 1 3 3    
Affiliated Entity | Wyndham Rewards            
Related Party Transaction [Line Items]            
Revenue from former parent $ 2 $ 4 $ 5 $ 7    
Affiliated Entity | Sale of European Vacation Rentals Business            
Related Party Transaction [Line Items]            
Related Party Transaction, Post Closing-Adjustment to Reduce Net Consideration         $ 44