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Stock-Based Compensation Incentive Equity Awards Activity - Summary of Market Performance Units Valuation Assumptions (Details) - Performance Share Units - RTSR - $ / shares		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant date fair value		$ 7.82	$ 25.45	$ 27.98
Weighted average correlation coefficient		0.42	0.44	0.53
Weighted average risk-free interest rate		2.50%	2.60%	1.50%
Weighted average dividend yield		0.00%	0.00%	0.00%
Realogy and comparable companies
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average expected volatility (a)	[1]	34.80%	29.80%	29.00%
S&P 400
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average expected volatility (a)		13.50%
XHB
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average expected volatility (a)			17.90%	18.40%
[1] Expected volatility is based on historical volatilities of the Company and select comparable companies.

X

- Definition

Correlation Coefficient used to model the way in which Realogy tends to move in relation to XHB as a whole.

+ References

No definition available.

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X

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(iii)
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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

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-Publisher FASB
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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