Annual report pursuant to Section 13 and 15(d)

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

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Transactions With Former Parent (Net Transfer to and Ne Contribution from Former Parent) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Related Party Transaction [Line Items]      
Transfer from (to) Parent   $ (38) $ (59)
Capital contribution from former Parent $ 68 106 0
Dividend to former Parent $ 0 (109) 0
Wyndham Worldwide      
Related Party Transaction [Line Items]      
Transfer from (to) Parent   222 (59)
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  
Due from Related Parties   260  
Wyndham Worldwide | Cash pooling and general financing activities      
Related Party Transaction [Line Items]      
Transfer from (to) Parent   (110) (227)
Wyndham Worldwide | Indirect general corporate overhead allocations      
Related Party Transaction [Line Items]      
Transfer from (to) Parent   12 35
Wyndham Worldwide | Corporate allocations for shared services      
Related Party Transaction [Line Items]      
Transfer from (to) Parent   13 29
Wyndham Worldwide | Stock-based compensation allocations      
Related Party Transaction [Line Items]      
Transfer from (to) Parent   20 11
Wyndham Worldwide | Income taxes      
Related Party Transaction [Line Items]      
Transfer from (to) Parent   $ 27 $ 93