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Interest Rate, Credit, and Market Risk Exposures (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Principal value of variable rate long term debt $ 1,732    
Securitization obligations $ 106 $ 206  
Realogy Brokerage Group | Geographic Concentration Risk - California      
Concentration risk, geographic area, revenue 24.00% 25.00% 27.00%
Realogy Brokerage Group | Geographic Concentration Risk - New York      
Concentration risk, geographic area, revenue 20.00% 22.00% 20.00%
Realogy Brokerage Group | Geographic Concentration Risk - Florida      
Concentration risk, geographic area, revenue 11.00% 10.00% 9.00%
Minimum      
Fixed interest rate of swaps 2.07%    
Maximum      
Fixed interest rate of swaps 3.11%    
Interest rate swap contracts      
Derivative, Notional Amount $ 1,000