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Earnings Per Share Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended 28 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Earnings Per Share [Abstract]          
Net income attributable to Realogy Holdings shareholders $ 123 $ 109 [1] $ 56 $ 81  
Basic 126.5 137.6 128.4 138.6  
Stock options, restricted stock units and performance share units (a) [2] 1.1 1.3 1.3 1.3  
Weighted average diluted shares 127.6 138.9 129.7 139.9  
Basic earnings per share $ 0.97 $ 0.79 $ 0.44 $ 0.58  
Diluted earnings per share $ 0.96 $ 0.78 $ 0.43 $ 0.58  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 7.3 5.8 7.1 5.8  
Stock Repurchases [Abstract]          
Shares Repurchased and Retired During Period, Shares 4.1   7.8   24.3
Shares Repurchased and Retired During Period, Value $ 101   $ 200   $ 674
Weighted Average Market Price of Shares Repurchased and Retired During Period $ 24.94   $ 25.73   $ 27.80
[1] Includes an $8 million expense related to the settlement of the Strader legal matter in Corporate and Other.
[2] The three and six months ended June 30, 2018 respectively exclude 7.3 million and 7.1 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 six months ended June 30, 2017 both exclude 5.8 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.