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Stock-Based Compensation Incentive Equity Awards Activity - Summary of Market Performance Units Valuation Assumptions (Details) - Performance Share Units - RTSR [Member]
9 Months Ended
Sep. 30, 2015
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted average grant date fair value $ 41.08
Weighted average correlation coefficient 0.57
Weighted average risk-free interest rate 1.00%
Weighted average dividend yield 0.00%
Realogy and comparable companies [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted average expected volatility 25.10%
XHB [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted average expected volatility 21.10%