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Commitments And Contingencies Other Guarantees, Insurance and Self-Insurance (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]    
Insurance liabilities $ 25,000 $ 24,000
Self insurance accruals 15,000 $ 15,000
Maximum    
Loss Contingencies [Line Items]    
Guarantees, gross 10,000  
Fidelity Insurance    
Loss Contingencies [Line Items]    
Insurance deductible 750  
Fidelity Insurance | Maximum    
Loss Contingencies [Line Items]    
Insurance liabilities 30,000  
Realogy Brokerage Group | Errors and Omissions Insurance    
Loss Contingencies [Line Items]    
Insurance liabilities 15,000  
Insurance deductible 1,000  
Realogy Brokerage Group | Errors and Omissions Insurance including additional Realogy Group Coverage    
Loss Contingencies [Line Items]    
Insurance deductible 1,000  
Realogy Brokerage Group | Errors and Omissions Insurance including additional Realogy Group Coverage | Maximum    
Loss Contingencies [Line Items]    
Insurance liabilities 60,000  
Realogy Group | Errors and Omissions Insurance    
Loss Contingencies [Line Items]    
Insurance deductible 2,500  
Realogy Group | Errors and Omissions Insurance | Maximum    
Loss Contingencies [Line Items]    
Insurance liabilities 45,000  
Realogy Title Group | Maximum    
Loss Contingencies [Line Items]    
Underwriter of title insurance policies, value, per policy 1,500  
Realogy Title Group | Minimum    
Loss Contingencies [Line Items]    
Underwriter of title insurance policy, reinsurance policy obtained from national underwriter, value per policy $ 1,500