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Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 2 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2017
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Feb. 23, 2017
Earnings Per Share [Abstract]                          
Net income attributable to Realogy Holdings shareholders   $ (22) $ 103 $ 123 $ (67) $ 255 $ 95 $ 109 $ (28) $ 137 $ 431 $ 213  
Basic weighted average shares                   124.0 136.7 144.5  
Stock options, restricted stock units and performance share units (a) [1]                   1.3 1.7 1.3  
Weighted average diluted shares                   125.3 138.4 145.8  
Earnings Per Share, Basic   $ (0.19) [2] $ 0.84 [2] $ 0.97 [2] $ (0.51) [2] $ 1.91 [3] $ 0.70 [3] $ 0.79 [3] $ (0.20) [3] $ 1.10 $ 3.15 $ 1.47  
Earnings Per Share, Diluted   $ (0.19) [2] $ 0.83 [2] $ 0.96 [2] $ (0.51) [2] $ 1.89 [3] $ 0.69 [3] $ 0.78 [3] $ (0.20) [3] $ 1.09 $ 3.11 $ 1.46  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount                   6.9 5.3 4.5  
Stock Repurchases [Line Items]                          
Stock Repurchased and Retired During Period, Shares                   17.9 9.4 7.1  
Stock Repurchased and Retired During Period, Value                   $ 402 $ 280 $ 195  
Stock Repurchased and Retired During Period, Weighted Average Market Price                   $ 22.47 $ 29.38 $ 27.96  
Maximum                          
Stock Repurchases [Line Items]                          
Stock Repurchase Program, Authorized Amount                         $ 925
Common Stock Settlement Date after Period End [Member]                          
Stock Repurchases [Line Items]                          
Stock Repurchased and Retired During Period, Shares 0.2                        
Stock Repurchased and Retired During Period, Value                     $ 276 $ 199  
[1] Excludes 6.9 million, 5.3 million and 4.5 million shares of common stock issuable for incentive equity awards which includes performance share units based on the achievement of target amounts, for the years ended December 31, 2018, 2017 and 2016, respectively, 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 15 "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.