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Intangible Assets Goodwill (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) real_estate_brokerage_operations | Dec. 31, 2019 USD ($) real_estate_brokerage_operations | Dec. 31, 2018 USD ($) real_estate_brokerage_operations | Dec. 31, 2008 USD ($) | Dec. 31, 2007 USD ($) | Dec. 31, 2020 USD ($)
Goodwill and Intangible Asset Impairment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Goodwill |  |  |  |  |  |  | $ 540 | [1] | $ 253 | [2] |  |  | $ 1,279 | $ 507 |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill Balance, beginning of period |  |  | $ 3,460 |  |  | $ 3,460 | 3,460 |  | 3,712 |  | $ 3,710 |  |  |  |
Goodwill acquired |  |  |  |  |  |  | 1 | [3] | 1 | [4] | 2 | [5] |  |  |
Goodwill reduction for sale of a business |  |  |  |  |  |  | (11) |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  | (540) | [1] | (253) | [2] |  |  | $ (1,279) | $ (507) |
Goodwill Balance, end of period |  | $ 2,910 |  | $ 3,460 |  |  | 2,910 |  | 3,460 |  | 3,712 |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,489
Accumulated impairments (f) | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,579)
Balance at December 31, 2020 |  | 2,910 | 3,460 | 3,460 |  | 3,460 | 3,460 |  | 3,712 |  | 3,712 |  |  |  | 2,910
Realogy Franchise Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Goodwill |  | 22 |  | 16 |  | 105 | 127 | [1] | 16 | [2] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill Balance, beginning of period |  |  | 2,636 |  |  | 2,636 | 2,636 |  | 2,652 |  | 2,652 |  |  |  |
Goodwill acquired |  |  |  |  |  |  | 0 | [3] | 0 | [4] | 0 | [5] |  |  |
Goodwill reduction for sale of a business |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  | (22) |  | (16) |  | (105) | (127) | [1] | (16) | [2] |  |  |  |  |
Goodwill Balance, end of period |  | 2,509 |  | 2,636 |  |  | 2,509 |  | 2,636 |  | 2,652 |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,956
Accumulated impairments (f) | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,447)
Balance at December 31, 2020 |  | 2,509 | 2,636 | 2,636 |  | 2,636 | 2,509 |  | 2,636 |  | 2,652 |  |  |  | 2,509
Realogy Franchise Group | Amortizable—Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  |  |  |  |  | 18 |  | 4 |  |  |  |  |  |
Realogy Franchise Group | Indefinite life—Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | 34 | 30 |  |  |  |  |  |  |  |  |  |  |  |
Realogy Brokerage Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Goodwill |  |  | 413 |  | $ 237 |  | 413 | [1] | 237 | [2] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill Balance, beginning of period |  |  | 669 |  |  | 669 | 669 |  | 906 |  | 904 |  |  |  |
Goodwill acquired |  |  |  |  |  |  | 0 | [3] | 0 | [4] | 2 | [5] |  |  |
Goodwill reduction for sale of a business |  |  |  |  |  |  | (11) |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  | (413) |  | $ (237) |  | (413) | [1] | (237) | [2] |  |  |  |  |
Goodwill Balance, end of period |  | 245 |  | 669 |  |  | 245 |  | 669 |  | 906 |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,053
Accumulated impairments (f) | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  | (808)
Balance at December 31, 2020 |  | 245 | 669 | 669 |  | 669 | 245 |  | 669 |  | $ 906 |  |  |  | 245
Number of Businesses Acquired | real_estate_brokerage_operations |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Realogy Title Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill and Intangible Asset Impairment [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Goodwill |  |  |  |  |  |  | 0 | [1] | 0 | [2] |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill Balance, beginning of period |  |  | 155 |  |  | 155 | 155 |  | 154 |  | $ 154 |  |  |  |
Goodwill acquired |  |  |  |  |  |  | 1 | [3] | 1 | [4] | 0 | [5] |  |  |
Goodwill reduction for sale of a business |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  | 0 | [1] | 0 | [2] |  |  |  |  |
Goodwill Balance, end of period |  | 156 |  | 155 |  |  | 156 |  | 155 |  | 154 |  |  |  |
Goodwill, Impaired, Accumulated Impairment Loss [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross goodwill |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 480
Accumulated impairments (f) | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  | (324)
Balance at December 31, 2020 |  | $ 156 | $ 155 | $ 155 |  | $ 155 | $ 156 |  | $ 155 |  | $ 154 |  |  |  | $ 156
Number of Businesses Acquired | real_estate_brokerage_operations |  |  |  |  |  |  | 2 |  | 2 |  |  |  |  |  |
[1] | 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.
[2] | 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.
[3] | Goodwill acquired during the year ended December 31, 2020 relates to the acquisition of two title and settlement operations.
[4] | Goodwill acquired during the year ended December 31, 2019 relates to the acquisition of two title and settlement operations.
[5] | Goodwill acquired during the year ended December 31, 2018 relates to the acquisition of three real estate brokerage operations.
[6] | Includes impairment charges which reduced goodwill by $540 million during 2020, $253 million during 2019, $1,279 million during 2008 and $507 million during 2007.

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