Quarterly report pursuant to Section 13 or 15(d)

Transactions With Former Parent (Narrative) (Details)

v3.19.3
Transactions With Former Parent (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]              
Contract termination $ (34) $ (9) $ 0 $ (9) $ (43) $ 0  
Wyndham Worldwide              
Related Party Transaction [Line Items]              
Other Contributions From Former Parent, Net           20  
Wyndham Worldwide | Information technology support, financial services, human resources and other shared services              
Related Party Transaction [Line Items]              
Expense for services provided by Parent           13  
Wyndham Worldwide | Indirect general corporate overhead allocations              
Related Party Transaction [Line Items]              
Expense for services provided by Parent           12  
Wyndham Worldwide | Insurance              
Related Party Transaction [Line Items]              
Expense for services provided by Parent           1  
Wyndham Worldwide | Defined contribution benefit plan              
Related Party Transaction [Line Items]              
Expense for services provided by Parent           2  
Wyndham Worldwide | Separation and distribution agreement              
Related Party Transaction [Line Items]              
Revenue from former parent 1   5   4 5  
Wyndham Worldwide | Licensing Agreements              
Related Party Transaction [Line Items]              
Revenue from former parent 31   30   82 63  
Wyndham Worldwide | Wyndham Rewards              
Related Party Transaction [Line Items]              
Revenue from former parent 4   $ 6   15 $ 16  
Wyndham Worldwide | Other Assets [Member]              
Related Party Transaction [Line Items]              
Other Contributions From Former Parent, Net   $ 28          
Other non-current liabilities              
Related Party Transaction [Line Items]              
Separation and Distribution Agreement, Contingent Liability Assumed, Remaining Amount 22       22   $ 24
Other Current Liabilities              
Related Party Transaction [Line Items]              
Separation and Distribution Agreement, Contingent Liability Assumed, Remaining Amount 2       2   11
Other Current Assets              
Related Party Transaction [Line Items]              
Receivables Due From Former Parent $ 7       $ 7   $ 44