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Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Feb. 24, 2016
Earnings Per Share [Abstract]                        
Net income attributable to Realogy Holdings shareholders $ 57 $ 106 $ 92 $ (42) $ 9 $ 110 $ 97 $ (32) $ 213 $ 184 $ 143  
Basic weighted average shares                 144.5 146.5 146.0  
Stock options, restricted stock, restricted stock units and performance share units (a) [1]                 1.3 1.6 1.2  
Weighted average diluted shares                 145.8 148.1 147.2  
Earnings Per Share, Basic $ 0.40 [2] $ 0.74 [2] $ 0.63 [2] $ (0.29) [2] $ 0.06 [3] $ 0.75 [3] $ 0.66 [3] $ (0.22) [3] $ 1.47 $ 1.26 $ 0.98  
Earnings Per Share, Diluted $ 0.40 [2] $ 0.73 [2] $ 0.63 [2] $ (0.29) [2] $ 0.06 [3] $ 0.74 [3] $ 0.66 [3] $ (0.22) [3] $ 1.46 $ 1.24 $ 0.97  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount                 4.5 3.5 3.3  
Stock Repurchases [Line Items]                        
Stock Repurchased and Retired During Period, Shares                 6.9      
Stock Repurchased and Retired During Period, Value                 $ 195      
Stock Repurchased and Retired During Period, Weighted Average Market Price                 $ 28.01      
Maximum [Member]                        
Stock Repurchases [Line Items]                        
Stock Repurchase Program, Authorized Amount                       $ 275
[1] Excludes 4.5 million, 3.5 million and 3.3 million shares of common stock issuable for incentive equity awards for the years ended December 31, 2016, 2015 and 2014, respectively, which includes performance share units based on the achievement of target amounts that are anti-dilutive to the diluted earnings per share computation.
[2] Basic and diluted EPS amounts in each quarter are computed using the weighted-average number of shares outstanding during that quarter, while basic and diluted EPS for the full year is computed using the weighted-average number of shares outstanding during the year. Therefore, the sum of the four quarters’ basic or diluted EPS may not equal the full year basic or diluted EPS (see Note 16 "Earnings Per Share" for further information).
[3] Basic and diluted EPS amounts in each quarter are computed using the weighted-average number of shares outstanding during that quarter, while basic and diluted EPS for the full year is computed using the weighted-average number of shares outstanding during the year. Therefore, the sum of the four quarters’ basic or diluted EPS may not equal the full year basic or diluted EPS.