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Short-Term Debt - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Nov. 30, 2019
Nov. 30, 2014
Short-term Debt [Line Items]        
Average balance of short-term debt $ 1,970,000,000 $ 1,510,000,000    
Accrued interest payable on short-term debt 6,000,000 4,000,000    
Convertible notes   201,000,000 $ 201,000,000  
Committed line of credit 10,000,000      
Collateral at fair value 3,000,000      
Committed line of credit with financial institutions, outstanding 0 0    
Exchangeable senior notes due 2019 | Convertible notes        
Short-term Debt [Line Items]        
Debt instrument interest rate       5.625%
Deferred debt issuance costs   $ 1,000,000    
Servicer advance financing        
Short-term Debt [Line Items]        
Accrued interest payable on short-term debt 200,000      
Unamortized capitalized commitment costs 1,000,000      
Residential Loans        
Short-term Debt [Line Items]        
Servicing asset at fair value, amount $ 176,000,000