Quarterly report pursuant to Section 13 or 15(d)

Transactions With Former Parent (Net Contributions From Former Parent) (Details)

v3.10.0.1
Transactions With Former Parent (Net Contributions From Former Parent) (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Related Party Transaction [Line Items]    
Capital contribution from former Parent $ 106 $ 0
Dividend to former Parent (90) $ 0
Net contribution from former Parent 233  
Wyndham Worldwide    
Related Party Transaction [Line Items]    
Contribution of outstanding borrowings due to former Parent 197  
Capital contribution from former Parent 106  
Dividend to former Parent (90)  
Other contributions from former Parent, net 20  
Net contribution from former Parent $ 233