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Revenue Recognition - Deferred Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Jan. 01, 2021
Dec. 31, 2020
Jan. 01, 2020
Deferred Revenue Arrangement [Line Items]        
Royalty Rate 600.00%      
Deferred Revenue $ 93     $ 82
Deferred Revenue, Revenue Recognized 172      
Movement in Deferred Revenue [Roll Forward]        
Additions during the period 183      
Recognized as Revenue during the period (172)      
Ending Balance at December 31, 2021 93      
Realogy Franchise Group        
Deferred Revenue Arrangement [Line Items]        
Deferred Revenue [1] 79     70
Deferred Revenue, Revenue Recognized [1] 169      
Deferred Sales Commission 26   $ 25  
Movement in Deferred Revenue [Roll Forward]        
Additions during the period [1] 178      
Recognized as Revenue during the period [1] (169)      
Ending Balance at December 31, 2021 [1] 79      
Realogy Franchise Group | Brand Marketing Fees        
Deferred Revenue Arrangement [Line Items]        
Deferred Revenue 25 $ 14    
Movement in Deferred Revenue [Roll Forward]        
Ending Balance at December 31, 2021 25      
Realogy Franchise Group | Area Development Fees        
Deferred Revenue Arrangement [Line Items]        
Deferred Revenue 41 43    
Deferred Revenue, Revenue Recognized 5      
Movement in Deferred Revenue [Roll Forward]        
Additions during the period 3      
Recognized as Revenue during the period (5)      
Ending Balance at December 31, 2021 41      
Realogy Franchise Group | Network Fees        
Deferred Revenue Arrangement [Line Items]        
Deferred Revenue 0 0    
Deferred Revenue, Revenue Recognized 5      
Movement in Deferred Revenue [Roll Forward]        
Additions during the period 5      
Recognized as Revenue during the period (5)      
Ending Balance at December 31, 2021 0      
Realogy Franchise Group | Outsourcing Management Fees        
Deferred Revenue Arrangement [Line Items]        
Deferred Revenue 4 3    
Deferred Revenue, Revenue Recognized 40      
Movement in Deferred Revenue [Roll Forward]        
Additions during the period 41      
Recognized as Revenue during the period (40)      
Ending Balance at December 31, 2021 $ 4      
Realogy Franchise Group | International Franchise Rights        
Deferred Revenue Arrangement [Line Items]        
Amortization period 25 years      
Realogy Franchise Group | Franchise Rights        
Deferred Revenue Arrangement [Line Items]        
Amortization period 30 years      
Realogy Brokerage Group        
Deferred Revenue Arrangement [Line Items]        
Deferred Revenue $ 14     $ 12
Deferred Revenue, Revenue Recognized 3      
Movement in Deferred Revenue [Roll Forward]        
Additions during the period 5      
Recognized as Revenue during the period (3)      
Ending Balance at December 31, 2021 14      
Realogy Brokerage Group | New Development Business        
Deferred Revenue Arrangement [Line Items]        
Deferred Revenue 11 $ 9    
Movement in Deferred Revenue [Roll Forward]        
Additions during the period 2      
Ending Balance at December 31, 2021 $ 11      
Realogy Brokerage Group | Minimum        
Deferred Revenue Arrangement [Line Items]        
New Development Period 18 months      
Realogy Brokerage Group | Maximum        
Deferred Revenue Arrangement [Line Items]        
New Development Period 24 months      
[1] Revenues recognized include intercompany marketing fees paid by Realogy Brokerage Group.