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Earnings Per Share Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended 31 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Earnings Per Share [Abstract]          
Net income attributable to Realogy Holdings shareholders $ 103 $ 95 $ 159 $ 176 [1]  
Basic 122.7 136.1 126.5 137.8  
Stock options, restricted stock units and performance share units (a) [2] 0.9 2.0 1.1 1.6  
Weighted average diluted shares 123.6 138.1 127.6 139.4  
Basic earnings per share $ 0.84 $ 0.70 $ 1.26 $ 1.28  
Diluted earnings per share $ 0.83 $ 0.69 $ 1.25 $ 1.26  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 7.4 4.9 7.2 5.3  
Stock Repurchases [Abstract]          
Shares Repurchased and Retired During Period, Shares 4.7   12.5   29.0
Shares Repurchased and Retired During Period, Value $ 102 $ 59 $ 302 $ 180 $ 776
Weighted Average Market Price of Shares Repurchased and Retired During Period $ 21.37   $ 24.07   $ 26.74
[1] Includes an $8 million expense related to the settlement of the Strader legal matter in Corporate and Other.
[2] The three and nine months ended September 30, 2018, respectively exclude 7.4 million and 7.2 million shares of common stock issuable for incentive equity awards, which includes performance share units based on the achievement of target amounts, that are anti-dilutive to the diluted earnings per share computation. The three and nine months ended September 30, 2017, respectively, exclude 4.9 million and 5.3 million shares of common stock issuable for incentive equity awards, which includes performance share units based on the achievement of target amounts, that are anti-dilutive to the diluted earnings per share computation.