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
6 Months Ended
Jun. 30, 2018
Jun. 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 234  
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 21  
Net contribution from former Parent $ 234