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Revenue Recognition - Deferred Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Deferred Revenue Arrangement [Line Items]        
Royalty Rate 600.00%      
Deferred Revenue $ 82 $ 82 $ 93  
Deferred Revenue, Revenue Recognized 161      
Movement in Deferred Revenue [Roll Forward]        
Additions during the period 150      
Recognized as Revenue during the period (161)      
Ending Balance at December 31, 2020 82      
Realogy Franchise Group        
Deferred Revenue Arrangement [Line Items]        
Deferred Revenue [1] 70 70 80  
Deferred Revenue, Revenue Recognized [1] 157      
Deferred Sales Commission   25   $ 24
Movement in Deferred Revenue [Roll Forward]        
Additions during the period [1] 147      
Recognized as Revenue during the period [1] (157)      
Ending Balance at December 31, 2020 [1] 70      
Realogy Franchise Group | Brand Marketing Fees        
Deferred Revenue Arrangement [Line Items]        
Deferred Revenue 14 14 13  
Movement in Deferred Revenue [Roll Forward]        
Ending Balance at December 31, 2020 14      
Realogy Franchise Group | Area Development Fees        
Deferred Revenue Arrangement [Line Items]        
Deferred Revenue 43 43 48  
Deferred Revenue, Revenue Recognized 7      
Movement in Deferred Revenue [Roll Forward]        
Additions during the period 2      
Recognized as Revenue during the period (7)      
Ending Balance at December 31, 2020 43      
Realogy Franchise Group | Network Fees        
Deferred Revenue Arrangement [Line Items]        
Deferred Revenue 0 0 3  
Deferred Revenue, Revenue Recognized 7      
Movement in Deferred Revenue [Roll Forward]        
Additions during the period 4      
Recognized as Revenue during the period (7)      
Ending Balance at December 31, 2020 0      
Realogy Franchise Group | Outsourcing Management Fees        
Deferred Revenue Arrangement [Line Items]        
Deferred Revenue 3 3 4  
Deferred Revenue, Revenue Recognized 41      
Movement in Deferred Revenue [Roll Forward]        
Additions during the period 40      
Recognized as Revenue during the period (41)      
Ending Balance at December 31, 2020 3      
Realogy Brokerage Group        
Deferred Revenue Arrangement [Line Items]        
Deferred Revenue 12 12 13  
Deferred Revenue, Revenue Recognized 4      
Movement in Deferred Revenue [Roll Forward]        
Additions during the period 3      
Recognized as Revenue during the period (4)      
Ending Balance at December 31, 2020 12      
Realogy Brokerage Group | New Development Business        
Deferred Revenue Arrangement [Line Items]        
Deferred Revenue 9 $ 9 $ 9  
Deferred Revenue, Revenue Recognized 2      
Movement in Deferred Revenue [Roll Forward]        
Additions during the period 2      
Recognized as Revenue during the period (2)      
Ending Balance at December 31, 2020 $ 9      
Minimum | Realogy Brokerage Group        
Deferred Revenue Arrangement [Line Items]        
New Development Period 18 months      
Maximum | Realogy Brokerage Group        
Deferred Revenue Arrangement [Line Items]        
New Development Period 24 months      
International Franchise Rights | Realogy Franchise Group        
Deferred Revenue Arrangement [Line Items]        
Amortization period 25 years      
Franchise Rights | Realogy Franchise Group        
Deferred Revenue Arrangement [Line Items]        
Amortization period 30 years      
[1] Revenues recognized include intercompany marketing fees paid by Realogy Brokerage Group.