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Note 10. Income Taxes Tax Sharing Agreement (Details)	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Guaranty Arrangement Percentage of Obligations Assumed by Realogy	62.50%

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- Definition

The percentage assumed by Realogy of guarantee commitments with Cendant (pursuant to the assumption of certain liabilities and the obligation to indemnify Cendant, Wyndham Worldwide and Travelport for such liabilities). These guarantee arrangements primarily relate to certain contingent litigation liabilities, contingent tax liabilities, and other corporate liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	rlgy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration