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Note 12. Stock-Based Compensation Incentive Equity Awards Activity - Summary of Market Performance Units Valuation Assumptions (Details) - Performance Share Units - RTSR [Member]
12 Months Ended
Dec. 31, 2016
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted average grant date fair value $ 27.99
Weighted average correlation coefficient 0.58
Weighted average risk-free interest rate 0.90%
Weighted average dividend yield 0.00%
XHB [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted average expected volatility 19.40%
Realogy and comparable companies [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Weighted average expected volatility 28.10%