Annual report pursuant to Section 13 and 15(d)

Transactions With Former Parent (Net Transfer to and Ne Contribution from Former Parent) (Details)

v3.10.0.1
Transactions With Former Parent (Net Transfer to and Ne Contribution from Former Parent) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]      
Transfer from (to) Parent $ (38) $ (59) $ (239)
Capital contribution from former Parent 106 0 0
Dividend to former Parent (109) 0 0
Wyndham Worldwide      
Related Party Transaction [Line Items]      
Transfer from (to) Parent 222 (59) (239)
Contribution of outstanding borrowings due to former Parent 197    
Capital contribution from former Parent 106    
Dividend to former Parent (109)    
Other Contributions From Former Parent, Net 66    
Wyndham Worldwide | Cash pooling and general financing activities      
Related Party Transaction [Line Items]      
Transfer from (to) Parent (110) (227) (390)
Wyndham Worldwide | Indirect general corporate overhead allocations      
Related Party Transaction [Line Items]      
Transfer from (to) Parent 12 35 34
Wyndham Worldwide | Corporate allocations for shared services      
Related Party Transaction [Line Items]      
Transfer from (to) Parent 13 29 29
Wyndham Worldwide | Stock-based compensation allocations      
Related Party Transaction [Line Items]      
Transfer from (to) Parent 20 11 10
Wyndham Worldwide | Income taxes      
Related Party Transaction [Line Items]      
Transfer from (to) Parent $ 27 $ 93 $ 78