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Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Feb. 23, 2017
Earnings Per Share [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (136) | $ (118) | $ 146 | $ 428 |
Net Income (Loss) Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 3 | 3 |
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent, Total |  | $ 17 |  | $ (121) |  | $ 68 |  | $ (85) |  | $ (19) |  | $ 93 |  | $ 118 |  | $ (49) |  |  | (121) | 143 | 425 |
Net (loss) income from discontinued operations |  | (62) |  | 8 |  | 1 |  | (14) |  | (3) |  | 10 |  | 5 |  | (18) |  |  | (67) | (6) | 6 |
Net (loss) income attributable to Realogy Holdings shareholders |  | $ (45) |  | $ (113) |  | $ 69 |  | $ (99) |  | $ (22) |  | $ 103 |  | $ 123 |  | $ (67) |  | $ (143) | $ (188) | $ 137 | $ 431 |
Basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 114.2 | 124.0 | 136.7 |
Dilutive effect of stock-based compensation (a) (b) | [1],[2] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0 | 1.3 | 1.7 |
Diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 114.2 | 125.3 | 138.4 |
Basic (loss) earnings per share from continuing operations |  | $ 0.15 | [3] | $ (1.06) | [3] | $ 0.59 | [3] | $ (0.75) | [3] | $ (0.16) | [4] | $ 0.76 | [4] | $ 0.93 | [4] | $ (0.38) | [4] |  | $ (1.06) | $ 1.15 | $ 3.11 |
Basic (loss) earnings per share from discontinued operations |  | (0.54) | [3] | 0.07 | [3] | 0.01 | [3] | (0.12) | [3] | (0.03) | [4] | 0.08 | [4] | 0.04 | [4] | (0.13) | [4] |  | (0.59) | (0.05) | 0.04 |
Basic (loss) earnings per share |  | (0.39) | [3] | (0.99) | [3] | 0.60 | [3] | (0.87) | [3] | (0.19) | [4] | 0.84 | [4] | 0.97 | [4] | (0.51) | [4] | $ (1.25) | (1.65) | 1.10 | 3.15 |
Diluted (loss) earnings per share from continuing operations |  | 0.15 | [3] | (1.06) | [3] | 0.59 | [3] | (0.75) | [3] | (0.16) | [4] | 0.75 | [4] | 0.92 | [4] | (0.38) | [4] |  | (1.06) | 1.14 | 3.07 |
Diluted (loss) earnings per share from discontinued operations |  | (0.54) | [3] | 0.07 | [3] | 0.01 | [3] | (0.12) | [3] | (0.03) | [4] | 0.08 | [4] | 0.04 | [4] | (0.13) | [4] |  | (0.59) | (0.05) | 0.04 |
Diluted (loss) earnings per share |  | $ (0.39) | [3] | $ (0.99) | [3] | $ 0.60 | [3] | $ (0.87) | [3] | $ (0.19) | [4] | $ 0.83 | [4] | $ 0.96 | [4] | $ (0.51) | [4] | $ (1.25) | $ (1.65) | $ 1.09 | $ 3.11 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.9 | 5.3 |
Stock Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.2 | 17.9 | 9.4 |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20 | $ 402 | $ 280 |
Stock Repurchased and Retired During Period, Weighted Average Market Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 17.21 | $ 22.47 | $ 29.38 |
Settlement Date [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 276 |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 825
[1] | The Company was in a net loss position for the year ended December 31, 2019 and therefore the impact of incentive equity awards were excluded from the computation of dilutive loss per share as the inclusion of such amounts would be anti-dilutive (see Note 14, "Stock-Based Compensation", for outstanding equity awards as of December 31, 2019).
[2] | The years ended December 31, 2018 and 2017, respectively, exclude 6.9 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.
[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 (see Note 17 "Earnings (Loss) Per Share" for further information).(d)As a result of the pending sale of Cartus Relocation Services, the Company met held for sale requirements under ASC 360 and discontinued operations under ASC 205 in the fourth quarter of 2019. Therefore, amounts presented in the Company's Form 10-Qs for the periods prior to the fourth quarter of 2019 did not reflect discontinued operations, but have been adjusted to reflect discontinued operations in the tables above.
[4] | 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.(d)As a result of the pending sale of Cartus Relocation Services, the Company met held for sale requirements under ASC 360 and discontinued operations under ASC 205 in the fourth quarter of 2019. Therefore, amounts presented in the Company's Form 10-Qs for the periods prior to the fourth quarter of 2019 did not reflect discontinued operations, but have been adjusted to reflect discontinued operations in the tables above.

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