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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 1,444 |  | $ 1,674 |  | $ 1,793 |  | $ 1,203 |  | $ 1,370 |  | $ 1,644 |  | $ 1,662 |  | $ 1,134 |  | $ 6,114 | [1],[2] | $ 5,810 | [1],[2] | $ 5,706 | [1],[2]
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) | 49 |  | 153 |  | 183 |  | (34) |  | 86 |  | 176 |  | 153 |  | (66) |  | 351 |  | 349 |  | 282 |
Net income (loss) attributable to Realogy Holdings and Realogy Group | $ 255 |  | $ 95 |  | $ 109 |  | $ (28) |  | $ 57 |  | $ 106 |  | $ 92 |  | $ (42) |  | $ 431 |  | $ 213 |  | $ 184 |
Earnings Per Share, Basic and Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic earnings per share | $ 1.91 | [3] | $ 0.70 | [3] | $ 0.79 | [3] | $ (0.20) | [3] | $ 0.40 | [4] | $ 0.74 | [4] | $ 0.63 | [4] | $ (0.29) | [4] | $ 3.15 |  | $ 1.47 |  | $ 1.26 |
Diluted earnings per share | $ 1.89 | [3] | $ 0.69 | [3] | $ 0.78 | [3] | $ (0.20) | [3] | $ 0.40 | [4] | $ 0.73 | [4] | $ 0.63 | [4] | $ (0.29) | [4] | $ 3.11 |  | $ 1.46 |  | $ 1.24 |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net | $ 3 |  | $ 2 |  | $ 2 |  | $ 5 |  | $ 9 |  | $ 9 |  | $ 12 |  | $ 9 |  | $ 12 |  | $ 39 |  | $ 10 |
Former parent legacy benefit, net |  |  | 1 |  | (11) |  |  |  | (3) |  |  |  |  |  | 1 |  | (10) |  | (2) |  | (15) |
Loss on the early extinguishment of debt |  |  | 1 |  |  |  | 4 |  |  |  |  |  |  |  |  |  | 5 |  | 0 |  | 48 |
Expense Related to the Transition of the Company's CEO | 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |
Interest Expense | Interest rate swap contracts | Not Designated as Hedging Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Gain (Loss) on Derivative, Net | 8 |  |  |  | (5) |  | 1 |  | 34 |  | 5 |  | (14) |  | (31) |  | 4 |  | (6) |  | (20) |
Strader |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Legal Fees |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |
Real Estate Franchise Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | 199 |  | 224 |  | 237 |  | 170 |  | 188 |  | 215 |  | 221 |  | 157 |  | 830 | [1],[2] | 781 | [1],[2] | 755 | [1],[2]
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) | 113 | [5] | 139 | [5] | 146 | [5] | 82 | [5] | 102 | [6] | 133 | [6] | 130 | [6] | 73 | [6] |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |
Company Owned Real Estate Brokerage Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | 1,087 |  | 1,267 |  | 1,392 |  | 897 |  | 1,004 |  | 1,231 |  | 1,268 |  | 841 |  | 4,643 | [1],[2] | 4,344 | [1],[2] | 4,344 | [1],[2]
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) | (14) | [5] | 36 | [5] | 65 | [5] | (35) | [5] | (8) | [6] | 55 | [6] | 63 | [6] | (32) | [6] |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 |  | 22 |  | 5 |
Relocation Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | 92 |  | 111 |  | 102 |  | 77 |  | 97 |  | 116 |  | 109 |  | 83 |  | 382 | [1],[2] | 405 | [1],[2] | 415 | [1],[2]
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) | 15 | [5] | 32 | [5] | 21 | [5] | (5) | [5] | 16 | [6] | 34 | [6] | 22 | [6] | (1) | [6] |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  | 1 |
Title and Settlement Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | 139 |  | 154 |  | 157 |  | 120 |  | 149 |  | 164 |  | 149 |  | 111 |  | 570 | [1],[2] | 573 | [1],[2] | 487 | [1],[2]
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) | 6 | [5] | 19 | [5] | 23 | [5] | (3) | [5] | 6 | [6] | 17 | [6] | 21 | [6] | (5) | [6] |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 1 |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | (73) | [7] | (82) | [7] | (95) | [7] | (61) | [7] | (68) | [8] | (82) | [8] | (85) | [8] | (58) | [8] | (311) | [1],[2],[9] | (293) | [1],[2],[9] | (295) | [1],[2],[9]
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) | $ (71) | [5] | $ (73) | [5] | $ (72) | [5] | $ (73) | [5] | $ (30) | [6] | $ (63) | [6] | $ (83) | [6] | $ (101) | [6] |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1 |  | $ 8 |  | $ 4 |
[1] | Revenues for the Relocation Services segment include intercompany referral commissions paid by the Company Owned Real Estate Brokerage Services segment of $40 million, $43 million and $49 million for the years ended December 31, 2017, 2016 and 2015, 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 $311 million, $293 million and $295 million for the years ended December 31, 2017, 2016 and 2015, respectively. Such amounts are eliminated through the Corporate and Other line.
[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 15 "Earnings Per Share" for further information).
[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.
[5] | The quarterly results include the following:•an $8 million expense related to the settlement of the Strader legal matter in the second quarter;•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 and former parent legacy net cost of $1 million in the third quarter;•a loss on the early extinguishment of debt of $4 million and $1 million in the first and third quarters, respectively;•mark-to-market adjustments for interest rate swaps of a $1 million gain, a $5 million loss, and an $8 million gain in the first, second and fourth quarters, respectively; and•an $8 million expense related to the transition of the Company's CEO in the fourth quarter.
[6] | The quarterly results include the following:•former parent legacy net cost of $1 million in the first quarter and former parent legacy net benefit of $3 million in the fourth quarter;•restructuring charges of $9 million, $12 million, $9 million and $9 million in the first, second, third and fourth quarters, respectively; and•mark-to-market adjustments for interest rate swaps of a $31 million loss, a $14 million loss, a $5 million gain, and a $34 million gain in the first, second, third and fourth quarters, respectively.
[7] | Represents the elimination of transactions primarily between the Real Estate Franchise Services segment and the Company Owned Real Estate Brokerage Services segment.
[8] | Represents the elimination of transactions primarily between the Real Estate Franchise Services segment and the Company Owned Real Estate Brokerage Services segment.
[9] | Includes the elimination of transactions between segments.

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