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Cover Page - $ / shares
 9 Months Ended
Sep. 30, 2019
Nov. 05, 2019
Dec. 31, 2018
Entity Information [Line Items]      
Document Type 10-Q    
Document Quarterly Report true    
Document Period End Date Sep. 30, 2019    
Document Transition Report false    
Entity File Number 001-35674    
Entity Registrant Name REALOGY HOLDINGS CORP.    
Entity Tax Identification Number 20-8050955    
Entity Address, Address Line One 175 Park Avenue    
Entity Address, City or Town Madison    
Entity Address, State or Province NJ    
Entity Address, Postal Zip Code 07940    
City Area Code 973    
Local Phone Number 407-2000    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol RLGY    
Security Exchange Name NYSE    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   114,340,545  
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01
Realogy Group LLC [Member]      
Entity Information [Line Items]      
Entity File Number 333-148153    
Entity Registrant Name REALOGY GROUP LLC    
Entity Tax Identification Number 20-4381990    
Entity Current Reporting Status No    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false