Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Incentive Equity Awards Granted by Wyndham Worldwide) (Details)

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Stock-Based Compensation (Incentive Equity Awards Granted by Wyndham Worldwide) (Details) - Wyndham Worldwide
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
RSUs  
Number of Units  
Balance as of December 31, 2017 (in shares) 0.3
Granted (in shares) 0.1
Vested/exercised (in shares) (0.1)
Balance as of March 31, 2018 (in shares) 0.3
Weighted Average Grant Price  
Balance as of December 31, 2017 (in dollars per share) | $ / shares $ 79.96
Granted (in dollars per share) | $ / shares 115.61
Vested/exercised (in dollars per share) | $ / shares 78.55
Balance as of March 31, 2018 (in dollars per share) | $ / shares $ 87.63
Aggregate unrecognized compensation expense | $ $ 21
Compensation expense not yet recognized, weighted average period 2 years 10 months
Number of shares outstanding 0.0
PSUs  
Number of Units  
Balance as of December 31, 2017 (in shares) 0.1
Granted (in shares) 0.0
Vested/exercised (in shares) 0.0
Balance as of March 31, 2018 (in shares) 0.1
Weighted Average Grant Price  
Balance as of December 31, 2017 (in dollars per share) | $ / shares $ 81.05
Granted (in dollars per share) | $ / shares 0.00
Vested/exercised (in dollars per share) | $ / shares 0.00
Balance as of March 31, 2018 (in dollars per share) | $ / shares $ 77.08
Aggregate unrecognized compensation expense | $ $ 2
Compensation expense not yet recognized, weighted average period 1 year 7 months