Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Operating Loss Carryforwards [Line Items]        
Effective tax rate 27.60% 41.50% 28.20% 40.40%
Federal and state        
Operating Loss Carryforwards [Line Items]        
Cash income tax payments, net of refunds   $ 11    
Foreign        
Operating Loss Carryforwards [Line Items]        
Cash income tax payments, net of refunds   $ 2 $ 7 $ 6
Wyndham Worldwide | Federal and state        
Operating Loss Carryforwards [Line Items]        
Cash income tax payments, net of refunds     $ 27 $ 39