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Summary of Significant Accounting Policies (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2008 | Dec. 31, 2007 | Dec. 31, 2018
Minimum ownership percentage for consolidation |  |  |  |  |  | 5000.00% |  |  |  |  |  |  |
Restricted Cash |  |  |  |  |  | $ 8 |  |  |  |  |  |  |
Goodwill |  | $ 2,910 |  |  |  | 2,923 | $ 2,910 |  | $ 3,460 |  |  |  | $ 3,712
Indefinite-lived Intangible Assets (Excluding Goodwill) |  |  |  |  |  | 712 |  |  |  |  |  |  |
Impairment of Goodwill |  |  |  |  |  |  | 540 | [1] | 253 | [2] | $ 1,279 | $ 507 |
Cartus Relocation Services Reserves Recorded |  |  |  | $ (133) |  |  |  |  | (22) |  |  |  |
Advertising Expense |  |  |  |  |  | 192 | 157 |  | 197 |  |  |  |
Restricted cash |  | 3 |  |  |  | 8 | 3 |  |  |  |  |  |
Indefinite life—Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) | [3] | 685 |  |  |  | 687 | 685 |  |  |  |  |  |
Realogy Brokerage Group |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 245 |  |  |  | 259 | 245 |  | 669 |  |  |  | 906
Impairment of Goodwill |  |  |  |  |  |  | 413 | [1] | 237 | [2] |  |  |
Realogy Franchise Group |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 2,509 |  |  |  | $ 2,506 | 2,509 |  | 2,636 |  |  |  | $ 2,652
Impairment of Goodwill |  | 22 |  |  | $ 105 |  | $ 127 | [1] | $ 16 | [2] |  |  |
Realogy Franchise Group | Amortizable—Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets, Finite-lived |  |  |  |  | $ 18 |  |  |  |  |  |  |  |
Realogy Franchise Group | Indefinite life—Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill) |  | $ 34 | $ 30 |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining maturity of highly-liquid investments |  |  |  |  |  | 3 months |  |  |  |  |  |  |
[1] | During the year ended December 31, 2020, the Company recognized a goodwill impairment charges of $413 million related to Realogy Brokerage Group and $127 million at Realogy Franchise Group which related to $105 million 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 and an additional goodwill impairment charge of $22 million during the fourth quarter of 2020 related to Cartus Relocation Services.
[2] | During the year ended December 31, 2019, the Company recognized goodwill impairment charges of $237 million related to Realogy Brokerage Group and $16 million at Realogy Franchise Group which 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.
[3] | Primarily related to real estate franchise brands, title and relocation tradenames which are expected to generate future cash flows for an indefinite period of time.

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- Definition 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; + References No definition available. + Details
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