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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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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;

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