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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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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
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 1,354 |  | $ 1,676 |  | $ 1,820 |  | $ 1,229 |  | $ 1,444 |  | $ 1,674 |  | $ 1,793 |  | $ 1,203 |  | $ 6,079 | [1],[2] | $ 6,114 | [1],[2],[3] | $ 5,810 | [1],[2],[3]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes, equity in earnings and noncontrolling interests (b) | (28) |  | 145 |  | 174 |  | (82) |  | 49 |  | 153 |  | 183 |  | (34) |  | 209 |  | 351 |  | 349 |
Net income (loss) attributable to Realogy Holdings and Realogy Group | $ (22) |  | $ 103 |  | $ 123 |  | $ (67) |  | $ 255 |  | $ 95 |  | $ 109 |  | $ (28) |  | $ 137 |  | $ 431 |  | $ 213 |
Earnings Per Share, Basic and Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share | $ (0.19) | [4] | $ 0.84 | [4] | $ 0.97 | [4] | $ (0.51) | [4] | $ 1.91 | [5] | $ 0.70 | [5] | $ 0.79 | [5] | $ (0.20) | [5] | $ 1.10 |  | $ 3.15 |  | $ 1.47 |
Diluted earnings per share | $ (0.19) | [4] | $ 0.83 | [4] | $ 0.96 | [4] | $ (0.51) | [4] | $ 1.89 | [5] | $ 0.69 | [5] | $ 0.78 | [5] | $ (0.20) | [5] | $ 1.09 |  | $ 3.11 |  | $ 1.46 |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net | $ 13 |  | $ 9 |  | $ 6 |  | $ 30 |  | $ 3 |  | $ 2 |  | $ 2 |  | $ 5 |  | $ 58 | [6],[7] | $ 12 | [6],[7] | $ 39 | [6],[7]
Former parent legacy cost (benefit), net | 4 |  |  |  |  |  |  |  |  |  | 1 |  | (11) |  |  |  | 4 | [8] | (10) | [8] | (2) | [8]
Loss on the early extinguishment of debt |  |  |  |  |  |  | 7 |  |  |  | 1 |  |  |  | 4 |  | 7 | [8] | 5 | [8] | 0 | [8]
Real Estate Franchise Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | 186 |  | 221 |  | 237 |  | 176 |  | 199 |  | 224 |  | 237 |  | 170 |  | 820 | [1],[2] | 830 | [1],[2],[3] | 781 | [1],[2],[3]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes, equity in earnings and noncontrolling interests (b) | 107 | [9] | 141 | [9] | 152 | [9] | 85 | [9] | 113 | [10] | 139 | [10] | 146 | [10] | 82 | [10] |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  | 1 |  | 4 |
Company Owned Real Estate Brokerage Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | 1,014 |  | 1,268 |  | 1,408 |  | 917 |  | 1,087 |  | 1,267 |  | 1,392 |  | 897 |  | 4,607 | [1],[2] | 4,643 | [1],[2],[3] | 4,344 | [1],[2],[3]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes, equity in earnings and noncontrolling interests (b) | (37) | [9] | 22 | [9] | 45 | [9] | (76) | [9] | (14) | [10] | 36 | [10] | 65 | [10] | (35) | [10] |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37 |  | 9 |  | 22 |
Relocation Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | 86 |  | 108 |  | 105 |  | 79 |  | 92 |  | 111 |  | 102 |  | 77 |  | 378 | [1],[2] | 382 | [1],[2],[3] | 405 | [1],[2],[3]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes, equity in earnings and noncontrolling interests (b) | 9 | [9] | 34 | [9] | 29 | [9] | (14) | [9] | 15 | [10] | 32 | [10] | 21 | [10] | (5) | [10] |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |  |  |  | 4 |
Title and Settlement Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | 136 |  | 162 |  | 162 |  | 120 |  | 139 |  | 154 |  | 157 |  | 120 |  | 580 | [1],[2] | 570 | [1],[2],[3] | 573 | [1],[2],[3]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes, equity in earnings and noncontrolling interests (b) | 1 | [9] | 18 | [9] | 26 | [9] | (8) | [9] | 6 | [10] | 19 | [10] | 23 | [10] | (3) | [10] |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  | 1 |  | 1 |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | (68) | [11] | (83) | [11] | (92) | [11] | (63) | [11] | (73) | [12] | (82) | [12] | (95) | [12] | (61) | [12] | (306) | [1],[2],[13] | (311) | [1],[2],[3],[13] | (293) | [1],[2],[3],[13]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes, equity in earnings and noncontrolling interests (b) | $ (108) | [9] | $ (70) | [9] | $ (78) | [9] | $ (69) | [9] | $ (71) | [10] | $ (73) | [10] | $ (72) | [10] | $ (73) | [10] |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3 |  | $ 1 |  | $ 8 |
[1] | Revenues for the Relocation Services segment include intercompany referral commissions paid by the Company Owned Real Estate Brokerage Services segment of $39 million, $40 million and $43 million for the years ended December 31, 2018, 2017 and 2016, respectively. Such amounts are recorded as contra-revenues by the Company Owned Real Estate Brokerage Services segment. There are no other material intersegment transactions.
[2] | Transactions between segments are eliminated in consolidation. Revenues for the Real Estate Franchise Services segment include intercompany royalties and marketing fees paid by the Company Owned Real Estate Brokerage Services segment of $306 million, $311 million and $293 million for the years ended December 31, 2018, 2017 and 2016, respectively. Such amounts are eliminated through the Corporate and Other line.
[3] | Prior period amounts have not been adjusted under the modified retrospective method.
[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 (see Note 15 "Earnings Per Share" for further information).
[5] | 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.
[6] | The year ended December 31, 2018 includes $56 million of expense related to the Leadership Realignment and Other Restructuring Activities program and $2 million of expense related to the Business Optimization Initiative program. The years ended December 31, 2017 and December 31, 2016 include expenses related to the Business Optimization Initiative program.
[7] | The year ended December 31, 2018 includes restructuring charges of $3 million in the Real Estate Franchise Services segment, $37 million in the Company Owned Real Estate Brokerage Services segment, $11 million in the Relocation Services segment, $4 million at the Title and Settlement Services segment and $3 million in the Corporate and Other segment.The year ended December 31, 2017 includes restructuring charges of $1 million in the Real Estate Franchise Services segment, $9 million in the Company Owned Real Estate Brokerage Services segment, $1 million at the Title and Settlement Services segment and $1 million in the Corporate and Other segment.The year ended December 31, 2016 includes restructuring charges of $4 million in the Real Estate Franchise Services segment, $22 million in the Company Owned Real Estate Brokerage Services segment, $4 million in the Relocation Services segment, $1 million at the Title and Settlement Services segment and $8 million in the Corporate and Other segment.
[8] | Former parent legacy items and loss on the early extinguishment of debt are recorded in the Corporate and Other segment.
[9] | The quarterly results include the following:•restructuring charges of $30 million, $6 million, $9 million and $13 million in the first, second, third and fourth quarters, respectively; •former parent legacy net cost of $4 million in the fourth quarter; and•a loss on the early extinguishment of debt of $7 million in the first quarter
[10] | The quarterly results include the following:•restructuring charges of $5 million, $2 million, $2 million and $3 million in the first, second, third and fourth quarters, respectively;•former parent legacy net benefit of $11 million in the second quarter former parent legacy net cost of $1 million in the third quarter; and•a loss on the early extinguishment of debt of $4 million and $1 million in the first and third quarters, respectively
[11] | Represents the elimination of transactions primarily between the Real Estate Franchise Services segment and the Company Owned Real Estate Brokerage Services segment.
[12] | Represents the elimination of transactions primarily between the Real Estate Franchise Services segment and the Company Owned Real Estate Brokerage Services segment.
[13] | Includes the elimination of transactions between segments.

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