Annual report pursuant to Section 13 and 15(d)

Transactions With Former Parent (Narrative) (Details)

v3.20.4
Transactions With Former Parent (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]              
Contract termination $ (1) $ 34 $ 9 $ 0 $ 0 $ 42 $ 0
Wyndham Hotels Defined Contribution Plans              
Related Party Transaction [Line Items]              
Defined contribution plan, cost         10 10 4
Other non-current liabilities              
Related Party Transaction [Line Items]              
Remaining amount of contingent liability assumed 22       18 22  
Current liabilities              
Related Party Transaction [Line Items]              
Remaining amount of contingent liability assumed 2       3 2  
Other current assets              
Related Party Transaction [Line Items]              
Receivables due from former parent $ 4       4 4  
Affiliated Entity              
Related Party Transaction [Line Items]              
Other contributions from former parent, net             66
Separation And Distribution Agreement | Affiliated Entity              
Related Party Transaction [Line Items]              
Revenue from former parent           6 7
Licensing Agreements | Wyndham Worldwide              
Related Party Transaction [Line Items]              
Revenue from former parent         65 106 84
Licensing Agreements | Affiliated Entity              
Related Party Transaction [Line Items]              
Revenue from former parent         6 7 6
Wyndham Rewards | Affiliated Entity              
Related Party Transaction [Line Items]              
Revenue from former parent         $ 13 18 21
Contract Termination Indemnification Obligation | Affiliated Entity              
Related Party Transaction [Line Items]              
Contract termination           8  
Other Assets | Affiliated Entity              
Related Party Transaction [Line Items]              
Other contributions from former parent, net           28  
Sale of European Vacation Rentals Business | Affiliated Entity              
Related Party Transaction [Line Items]              
Revenue from former parent             40
Percent of net proceeds         33.00%    
Post closing-adjustment to reduce net consideration           $ 44  
Information technology support, financial services, human resources and other shared services | Affiliated Entity              
Related Party Transaction [Line Items]              
Expense for services provided by Parent             13
Indirect general corporate overhead allocations | Affiliated Entity              
Related Party Transaction [Line Items]              
Expense for services provided by Parent             12
Insurance | Affiliated Entity              
Related Party Transaction [Line Items]              
Expense for services provided by Parent             1
Defined contribution benefit plan | Affiliated Entity              
Related Party Transaction [Line Items]              
Expense for services provided by Parent             $ 2