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Earnings Per Share Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Earnings Per Share [Abstract]          
Net income attributable to Realogy Holdings and Realogy Group $ 110 $ 100 $ 175 $ 122  
Basic weighted average shares 146,600,000 146,000,000 146,500,000 145,900,000  
Stock options, restricted stock, restricted stock units and performance share units (a) [1] 1,500,000 1,000,000 1,500,000 1,100,000  
Weighted average diluted shares 148,100,000 147,000,000 148,000,000 147,000,000  
Earnings Per Share, Basic $ 0.75 $ 0.68 $ 1.19 $ 0.84  
Earnings Per Share, Diluted $ 0.74 $ 0.68 $ 1.18 $ 0.83  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 3,600,000.0 3,700,000.0   3,600,000 3,700,000
[1] The three and nine months ended September 30, 2015, excludes 3.6 million and 3.7 million shares of common stock issuable for incentive equity awards, which includes performance share units based on the achievement of target amounts, respectively, that are anti-dilutive to the diluted earnings per share computation. The three and nine months ended September 30, 2014, excludes 3.7 million and 3.6 million shares of common stock issuable for incentive equity awards, which includes performance share units based on the achievement of target amounts, respectively, that are anti-dilutive to the diluted earnings per share computation.