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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 | Dec. 31, 2019 | Sep. 30, 2019 | Sep. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2008 | Dec. 31, 2007 | Dec. 31, 2017
Minimum ownership percentage for consolidation |  | 5000.00% |  |  |  |  | 5000.00% |  |  |  |  |  |  |
Restricted Cash |  | $ 3 |  | $ 3 |  |  | $ 3 |  | $ 3 |  |  |  |  |
Advertising Expense |  |  |  |  |  |  | 157 |  | 197 |  | $ 207 |  |  |
Goodwill |  | 2,910 |  | 3,460 |  |  | 2,910 |  | 3,460 |  | 3,712 |  |  | $ 3,710
Indefinite-lived Intangible Assets (Excluding Goodwill) |  | 705 |  |  |  |  | 705 |  |  |  |  |  |  |
Impairment of Goodwill |  |  |  |  |  |  | 540 | [1] | 253 | [2] |  | $ 1,279 | $ 507 |
Indefinite life—Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indefinite-lived Intangible Assets (Excluding Goodwill) | [3],[4] | 685 |  | 749 |  |  | 685 |  | 749 |  |  |  |  |
Realogy Brokerage Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 245 |  | 669 |  |  | 245 |  | 669 |  | 906 |  |  | 904
Impairment of Goodwill |  |  | $ 413 |  | $ 237 |  | 413 | [1] | 237 | [2] |  |  |  |
Realogy Franchise Group |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 2,509 |  | 2,636 |  |  | 2,509 |  | 2,636 |  | $ 2,652 |  |  | $ 2,652
Impairment of Goodwill |  | 22 |  | $ 16 |  | $ 105 | $ 127 | [1] | $ 16 | [2] |  |  |  |
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] | 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] | Primarily related to real estate franchise brands and relocation tradenames which are expected to generate future cash flows for an indefinite period of time.
[4] | Realogy Franchise Group's trademarks was impaired by $30 million during first quarter of 2020 and Cartus Relocation Services trademarks was impaired by $34 million during the fourth quarter of 2020.

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