Basis of Presentation (Notes)	12 Months Ended
Basis of Presentation (Notes)	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business Description and Basis of Presentation [Text Block]	BASIS OF PRESENTATION Realogy Holdings Corp. ("Realogy Holdings", "Realogy" or the "Company") is a holding company for its consolidated subsidiaries including Realogy Intermediate Holdings LLC ("Realogy Intermediate") and Realogy Group LLC ("Realogy Group") and its consolidated subsidiaries. Realogy, through its subsidiaries, is a global provider of residential real estate services. Neither Realogy Holdings, the indirect parent of Realogy Group, nor Realogy Intermediate, the direct parent company of Realogy Group, conducts any operations other than with respect to its respective direct or indirect ownership of Realogy Group. As a result, the consolidated financial positions, results of operations, comprehensive (loss) income and cash flows of Realogy Holdings, Realogy Intermediate and Realogy Group are the same. The accompanying Consolidated Financial Statements include the financial statements of Realogy Holdings and Realogy Group. Realogy Holdings' only asset is its investment in the common stock of Realogy Intermediate, and Realogy Intermediate's only asset is its investment in Realogy Group. Realogy Holdings' only obligations are its guarantees of certain borrowings and certain franchise obligations of Realogy Group. All expenses incurred by Realogy Holdings and Realogy Intermediate are for the benefit of Realogy Group and have been reflected in Realogy Group’s consolidated financial statements. The consolidated financial statements of the Company have been prepared in accordance with accounting principles generally accepted in the United States of America. All intercompany balances and transactions have been eliminated. Inclusion of Cartus Relocation Services in Continuing Operations The results of the Company's global relocation operations, Cartus Relocation Services, were presented as discontinued operations commencing in the fourth quarter of 2019 pending the sale of that business to a third party. However, during the fourth quarter of 2020, following termination of the proposed sale of that business and change in the company's expectations for sale, management determined that the held for sale and discontinued operations criteria in ASC Topic 360 and ASC Topic 205 were no longer met. As a result, the assets and liabilities of Cartus Relocation Services, previously presented as held for sale, have been reclassified to held and used on the Consolidated Balance Sheets as of December 31, 2020 and the results of Cartus Relocation Services have been reclassified from discontinued operations to continuing operations and included in the Realogy Franchise Group segment for all periods presented (see Note 18, "Segment Information", for additional information). Cartus Relocation Services’ assets and liabilities were measured at fair value upon reclassification and the reduction to the carrying value is reported in the Impairments line in the Consolidated Statements of Operations for the year ended December 31, 2020. Business Description The Company reports its operations in the following three business segments (the number of offices and agents are unaudited): •Realogy Franchise Group—franchises the Century 21®, Coldwell Banker®, Coldwell Banker Commercial®, Corcoran®, ERA®, Sotheby's International Realty® and Better Homes and Gardens® Real Estate brand names. As of December 31, 2020, our real estate franchise systems and proprietary brands had approximately 320,700 independent sales agents worldwide, including approximately 190,700 independent sales agents operating in the U.S. (which included approximately 53,100 company owned brokerage independent sales agents). As of December 31, 2020, our real estate franchise systems and proprietary brands had approximately 20,100 offices worldwide in 116 countries and territories, including approximately 5,800 brokerage offices in the U.S. (which included approximately 670 company owned brokerage offices). This segment also includes our lead generation and global relocation services operations. •Realogy Brokerage Group—operates a full-service real estate brokerage business with approximately 670 owned and operated brokerage offices with approximately 53,100 independent sales agents principally under the Coldwell Banker®, Corcoran® and Sotheby’s International Realty® brand names in many of the largest metropolitan areas in the U.S. •Realogy Title Group—provides full-service title, escrow and settlement services to real estate companies, corporations and financial institutions with many of these services provided in connection with the Company's real estate brokerage business. The title insurance underwriter, Title Resources Guaranty Company, provides title underwriting services relating to the closing of home purchases and refinancing of home loans, working with affiliated and independent agents. This segment also includes the Company's share of equity earnings for our Guaranteed Rate Affinity mortgage origination joint venture.