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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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