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Interest Rate, Credit, and Market Risk Exposures (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Principal value of variable rate long term debt $ 2,075    
Securitization obligations $ 231 $ 194  
Company Owned Real Estate Brokerage Services | California      
Concentration risk, geographic area, revenue 27.00% 27.00% 26.00%
Company Owned Real Estate Brokerage Services | New York      
Concentration risk, geographic area, revenue 20.00% 22.00% 22.00%
Company Owned Real Estate Brokerage Services | Florida      
Concentration risk, geographic area, revenue 9.00% 9.00% 9.00%
Minimum      
Fixed interest rate of swaps 2.07%    
Maximum      
Fixed interest rate of swaps 3.11%    
Interest rate swap contracts      
Notional value of derivative instrument $ 1,600