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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2008 | Dec. 31, 2007
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 1,889 |  | $ 1,909 |  | $ 1,255 |  | $ 1,168 |  | $ 1,392 |  | $ 1,629 |  | $ 1,735 |  | $ 1,114 |  |  | $ 6,221 | [1] | $ 5,870 | [1] | $ 6,079 | [1] |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) income before income taxes, equity in earnings and noncontrolling interests (b) | (7) | [2] | 82 | [2] | (54) | [2] | (612) | [2] | (10) | [3] | (141) | [3] | 97 | [3] | (135) | [3] |  | (591) |  | (189) |  | 209 |  |  |
Net (loss) income attributable to Realogy Holdings and Realogy Group | $ 18 | [2] | $ 98 | [2] | $ (14) | [2] | $ (462) | [2] | $ (45) | [3] | $ (113) | [3] | $ 69 | [3] | $ (99) | [3] |  | $ (360) |  | $ (188) |  | $ 137 |  |  |
Earnings Per Share, Basic and Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (loss) earnings per share | $ 0.16 | [4] | $ 0.85 | [4] | $ (0.12) | [4] | $ (4.03) | [4] | $ (0.39) | [5] | $ (0.99) | [5] | $ 0.60 | [5] | $ (0.87) | [5] |  | $ (3.13) |  | $ (1.65) |  | $ 1.10 |  |  |
Diluted (loss) earnings per share | $ 0.15 | [4] | $ 0.84 | [4] | $ (0.12) | [4] | $ (4.03) | [4] | $ (0.39) | [5] | $ (0.99) | [5] | $ 0.60 | [5] | $ (0.87) | [5] |  | $ (3.13) |  | $ (1.65) |  | $ 1.09 |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net | $ 20 |  | $ 17 |  | $ 18 |  | $ 12 |  | $ 20 |  | $ 11 |  | $ 9 |  | $ 12 |  |  | $ 67 | [6],[7] | $ 52 | [6],[7] | $ 58 | [6],[7] |  |
Impairment of Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 540 | [8] | 253 | [9] |  |  | $ 1,279 | $ 507
Cartus Relocation Services Reserves Recorded |  |  | (59) |  | (44) |  | (30) |  | (22) |  |  |  |  |  |  |  | $ (133) |  |  |  |  |  |  |  |
Other Asset Impairment Charges | 16 |  | 11 |  | 19 |  | 4 |  | 6 |  | 3 |  | 2 |  | 1 |  |  | 50 |  | 12 |  |  |  |  |
Former parent legacy cost, net |  |  | 1 |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  | 1 | [10] | 1 | [10] | 4 | [10] |  |
Loss (gain) on the early extinguishment of debt |  |  |  |  | 8 |  |  |  |  |  | (10) |  |  |  | 5 |  |  | 8 | [10] | (5) | [10] | 7 | [10] |  |
Realogy Franchise Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | 298 |  | 314 |  | 227 |  | 220 |  | 269 |  | 319 |  | 331 |  | 239 |  |  | 1,059 | [1] | 1,158 | [1] | 1,198 | [1] |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) income before income taxes, equity in earnings and noncontrolling interests (b) | 84 | [2] | 112 | [2] | 42 | [2] | 15 | [2] | 94 | [3] | 161 | [3] | 165 | [3] | 66 | [3] |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15 |  | 14 |  | 14 |  |  |
Impairment of Goodwill | 22 |  |  |  |  |  |  |  | 16 |  |  |  |  |  |  |  | $ 105 | 127 | [8] | 16 | [9] |  |  |  |
Realogy Franchise Group | Indefinite life—Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) | 34 |  |  |  |  |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Realogy Brokerage Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | 1,461 |  | 1,479 |  | 933 |  | 869 |  | 1,040 |  | 1,222 |  | 1,331 |  | 816 |  |  | 4,742 | [1] | 4,409 | [1] | 4,607 | [1] |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) income before income taxes, equity in earnings and noncontrolling interests (b) | 1 | [2] | 32 | [2] | (18) | [2] | (493) | [2] | (38) | [3] | (231) | [3] | 25 | [3] | (80) | [3] |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 37 |  | 25 |  | 37 |  |  |
Impairment of Goodwill |  |  |  |  |  |  | 413 |  |  |  | 237 |  |  |  |  |  |  | 413 | [8] | 237 | [9] |  |  |  |
Realogy Title Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | 226 |  | 213 |  | 160 |  | 137 |  | 152 |  | 170 |  | 160 |  | 114 |  |  | 736 | [1] | 596 | [1] | 580 | [1] |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) income before income taxes, equity in earnings and noncontrolling interests (b) | 25 | [2] | 36 | [2] | 21 | [2] | (1) | [2] | 7 | [3] | 21 | [3] | 22 | [3] | (13) | [3] |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  | 3 |  | 4 |  |  |
Impairment of Goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | [8] | 0 | [9] |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenues | (96) | [11] | (97) | [11] | (65) | [11] | (58) | [11] | (69) | [12] | (82) | [12] | (87) | [12] | (55) | [12] |  | (316) | [1],[13] | (293) | [1],[13] | (306) | [1],[13] |  |
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) income before income taxes, equity in earnings and noncontrolling interests (b) | $ (117) | [2] | $ (98) | [2] | $ (99) | [2] | $ (133) | [2] | $ (73) | [3] | $ (92) | [3] | $ (115) | [3] | $ (108) | [3] |  |  |  |  |  |  |  |  |
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring costs, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11 |  | $ 10 |  | $ 3 |  |  |
[1] | Transactions between segments are eliminated in consolidation. Revenues for Realogy Franchise Group include intercompany royalties and marketing fees paid by Realogy Brokerage Group of $316 million, $293 million and $306 million for the years ended December 31, 2020, 2019 and 2018, respectively. Such amounts are eliminated through the Corporate and Other line.
[2] | The quarterly results include the following:•restructuring charges of $12 million, $18 million, $17 million and $20 million in the first, second, third and fourth quarters, respectively; •a goodwill impairment charge of $413 million related to Realogy Brokerage Group and an impairment charge of $30 million related to Realogy Franchise Group's trademarks during the first quarter; •$30 million, $44 million and $59 million of reserves recorded during the three months ended March 31, 2020, June 30, 2020 and September 30, 2020, respectively, (while Cartus Relocation Services was held for sale) to reduce the net assets to the estimated proceeds which were included in Impairments in connection with the reclassification of Cartus Relocation Services as continuing operations during the fourth quarter of 2020; •a goodwill impairment charge of $22 million related to Cartus Relocation Services and an impairment charge of $34 million related to Cartus Relocation Services' trademarks during the fourth quarter; •$4 million, $19 million, $11 million and $16 million of other impairment charges primarily related to lease asset impairments incurred in the first, second, third and fourth quarters, respectively; •former parent legacy net cost of $1 million in the third quarter; and •a loss on the early extinguishment of debt of $8 million in the second quarter
[3] | The quarterly results include the following: •restructuring charges of $12 million, $9 million, $11 million and $20 million in the first, second, third and fourth quarters, respectively; •a goodwill impairment charge of $237 million related to Realogy Brokerage Group during the third quarter; •a $22 million reduction to record net assets held for sale at the lower of carrying value or fair value, less costs to sell, for Cartus Relocations Services which was presented as held for sale at December 31, 2019; •$1 million, $2 million, $3 million and $6 million of other impairment charges primarily related to lease asset impairments incurred in the first, second, third and fourth quarters, respectively; •former parent legacy net cost of $1 million in the third quarter; and •a loss on the early extinguishment of debt of $5 million in the first quarter and a gain on the early extinguishment of debt of $10 million in the third quarter
[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 16, "Earnings (Loss) 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] | Restructuring charges for the year ended December 31, 2020 include $65 million related to the Facility and Operational Efficiencies Program and $2 million related to the Leadership Realignment and Other Restructuring Activities Program. The year ended December 31, 2019 includes $47 million of expense related to the Facility and Operational Efficiencies Program and $5 million of expense primarily related to the Leadership Realignment and Other Restructuring Activities Program. The year ended December 31, 2018 includes costs primarily related to the Leadership Realignment and Other Restructuring Activities Program
[7] | The year ended December 31, 2020 includes restructuring charges of $15 million at Realogy Franchise Group, $37 million at Realogy Brokerage Group, $4 million at Realogy Title Group and $11 million at Corporate and Other. The year ended December 31, 2019 includes restructuring charges of $14 million at Realogy Franchise Group, $25 million at Realogy Brokerage Group, $3 million at Realogy Title Group and $10 million at Corporate and Other. The year ended December 31, 2018 includes restructuring charges of $14 million at Realogy Franchise Group, $37 million at Realogy Brokerage Group, $4 million at Realogy Title Group and $3 million at Corporate and Other.
[8] | The Company recognized a goodwill impairment charge of $105 million related to reserves recorded during the nine months ended September 30, 2020 (while Cartus Relocation Services was held for sale) to reduce the net assets to the estimated proceeds which were included in Impairments in connection with the reclassification of Cartus Relocation Services as continuing operations during the fourth quarter of 2020. Furthermore, the Company recognized an additional goodwill impairment charge of $22 million during the fourth quarter of 2020 related to Cartus Relocation Services.The Company recognized a goodwill impairment charge of $413 million during the first quarter of 2020 related to Realogy Brokerage Group.
[9] | The Company recognized a goodwill impairment charge of $16 million during the fourth quarter of 2019 related to the reduction to record net assets held for sale at the lower of carrying value or fair value, less costs to sell, for Cartus Relocation Services which was presented as held for sale at December 31, 2019.The Company recognized a goodwill impairment charge of $237 million during the third quarter of 2019 related to Realogy Brokerage Group.
[10] | Former parent legacy items and Loss (gain) on the early extinguishment of debt are recorded in Corporate and Other.
[11] | Represents the elimination of transactions primarily between Realogy Franchise Group and Realogy Brokerage Group.
[12] | Represents the elimination of transactions primarily between Realogy Franchise Group and Realogy Brokerage Group.
[13] | Includes the elimination of transactions between segments.

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