Income Taxes Tax Sharing Agreement (Details)	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Guaranty Arrangement Percentage of Obligations Assumed by Realogy	62.50%

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.

No definition available.

Name:	rlgy_GuarantyArrangementPercentageofObligationsAssumedbyRealogy
Namespace Prefix:	rlgy_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant