Quarterly report pursuant to Section 13 or 15(d)

Transactions With Former Parent (Narrative) (Details)

v3.19.1
Transactions With Former Parent (Narrative) (Details) - Wyndham Worldwide - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Information technology support, financial services, human resources and other shared services    
Related Party Transaction [Line Items]    
Expense for services provided by Parent   $ 7
Indirect general corporate overhead allocations    
Related Party Transaction [Line Items]    
Expense for services provided by Parent   9
Insurance    
Related Party Transaction [Line Items]    
Expense for services provided by Parent   1
Defined contribution benefit plan    
Related Party Transaction [Line Items]    
Expense for services provided by Parent   $ 2
Separation and distribution agreement    
Related Party Transaction [Line Items]    
Revenue from former parent $ 2  
Licensing Agreements    
Related Party Transaction [Line Items]    
Revenue from former parent 23  
Wyndham Rewards    
Related Party Transaction [Line Items]    
Revenue from former parent $ 6