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Goodwill (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2020 | Sep. 30, 2019 | Dec. 31, 2008 | Dec. 31, 2007 | Sep. 30, 2020 | Sep. 30, 2019
Goodwill [Roll Forward] |  |  |  |  |  |  |
Balance at December 31, 2019 |  | $ 3,300,000,000 |  |  |  | $ 3,300,000,000 |
Goodwill acquired |  |  |  |  |  | 0 |
Impairment loss |  | (413,000,000) | $ (237) | $ (1,153) | $ (489) | (413,000,000) |
Balance at September 30, 2020 |  |  |  |  |  | 2,887,000,000 |
Accumulated Impairment Losses | [1] |  |  |  |  | 2,292,000,000 |
Impairment Loss |  | 413,000,000 | 237 | $ 1,153 | $ 489 | 413,000,000 |
Realogy Franchise Group |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Balance at December 31, 2019 |  | 2,476,000,000 |  |  |  | 2,476,000,000 |
Goodwill acquired |  |  |  |  |  | 0 |
Impairment loss |  |  |  |  |  | 0 |
Balance at September 30, 2020 |  |  |  |  |  | 2,476,000,000 |
Accumulated Impairment Losses | [1] |  |  |  |  | 1,160,000,000 |
Impairment Loss |  |  |  |  |  | 0 |
Realogy Brokerage Group |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Balance at December 31, 2019 |  | 669,000,000 |  |  |  | 669,000,000 |
Goodwill acquired |  |  |  |  |  | 0 |
Impairment loss |  |  | (237,000,000) |  |  | (413,000,000) | $ (237,000,000)
Balance at September 30, 2020 |  |  |  |  |  | 256,000,000 |
Accumulated Impairment Losses | [1] |  |  |  |  | 808,000,000 |
Impairment Loss |  |  | $ 237,000,000 |  |  | 413,000,000 | $ 237,000,000
Realogy Title Group |  |  |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |  |  |
Balance at December 31, 2019 |  | $ 155,000,000 |  |  |  | 155,000,000 |
Goodwill acquired |  |  |  |  |  | 0 |
Impairment loss |  |  |  |  |  | 0 |
Balance at September 30, 2020 |  |  |  |  |  | 155,000,000 |
Accumulated Impairment Losses | [1] |  |  |  |  | 324,000,000 |
Impairment Loss |  |  |  |  |  | $ 0 |
[1] | Includes impairment charges which reduced goodwill by $413 million, $237 million, $1,153 million and $489 million during the first quarter of 2020, third quarter of 2019, fourth quarter of 2008 and fourth quarter of 2007, respectively.

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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