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Interest Rate, Credit, and Market Risk Exposures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Principal value of variable rate long term debt	$ 1,965
Realogy Brokerage Group | NEW YORK
Concentration risk, geographic area, revenue	22.00%	20.00%	22.00%
Realogy Brokerage Group | CALIFORNIA
Concentration risk, geographic area, revenue	25.00%	27.00%	27.00%
Realogy Brokerage Group | FLORIDA
Concentration risk, geographic area, revenue	10.00%	9.00%	9.00%
Minimum
Fixed interest rate of swaps	2.07%
Maximum
Fixed interest rate of swaps	3.11%
Interest rate swap contracts
Derivative, Notional Amount	$ 1,600

X

- Definition

Description of risks that arise due to concentrations of revenues in a certain geographic area, either domestic or foreign. The description may address risks inherent in the geographic area, and, at a minimum, informs users of the general nature of the risk, but excludes "Information about Geographic Areas" that may be disclosed elsewhere (for instance, segment disclosures).

+ References

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- Definition

The principal value of variable interest rate long-term debt.

+ References

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- Definition

Fixed interest rate related to the interest rate derivative.

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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