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Short-Term Debt - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Dec. 31, 2018
Nov. 15, 2018
Nov. 30, 2014
Short-term Debt [Line Items]          
Average balance of short-term debt $ 1,970,000,000 $ 1,810,000,000      
Accrued interest payable on short-term debt 3,000,000 3,000,000 $ 4,000,000    
Convertible notes       $ 201,000,000  
Committed line of credit 10,000,000 10,000,000      
Fair value of mortgage backed securities securing loan (in excess) 3,000,000 3,000,000      
Committed line of credit with financial institutions, outstanding 0 0 $ 0    
Short Term Borrowing Agreement          
Short-term Debt [Line Items]          
Trading securities pledged as collateral 677,000,000 677,000,000      
Convertible Debt | Exchangeable Senior Notes Due 2019          
Short-term Debt [Line Items]          
Accrued interest payable on short-term debt 4,000,000 4,000,000      
Debt Instrument interest rate     5.625%   5.625%
Unamortized deferred issuance costs     $ 1,000,000    
Sequoia Choice          
Short-term Debt [Line Items]          
Trading securities pledged as collateral     130,000,000    
Freddie Mac SLST          
Short-term Debt [Line Items]          
Trading securities pledged as collateral     229,000,000    
Freddie Mac K-Series          
Short-term Debt [Line Items]          
Trading securities pledged as collateral     18,000,000    
Residential          
Short-term Debt [Line Items]          
Securities pledged as collateral 736,000,000 736,000,000 844,000,000    
Sequoia securities | Sequoia Choice | Short Term Borrowing Agreement          
Short-term Debt [Line Items]          
Trading securities pledged as collateral 113,000,000 113,000,000      
Sequoia securities | Freddie Mac SLST | Short Term Borrowing Agreement          
Short-term Debt [Line Items]          
Trading securities pledged as collateral 385,000,000 385,000,000      
Sequoia securities | Freddie Mac K-Series | Short Term Borrowing Agreement          
Short-term Debt [Line Items]          
Trading securities pledged as collateral 209,000,000 209,000,000      
Single-family rental loans, held-for-sale at fair value          
Short-term Debt [Line Items]          
Collateral amounts 78,000,000 78,000,000 28,000,000    
Residential bridge loans          
Short-term Debt [Line Items]          
Collateral amounts 176,000,000 176,000,000 98,000,000    
Residential Loans          
Short-term Debt [Line Items]          
Servicing asset at fair value, amount 243,000,000 243,000,000      
Residential Loans          
Short-term Debt [Line Items]          
Loan pledged as collateral 253,000,000 253,000,000 $ 935,000,000    
Servicer advance financing          
Short-term Debt [Line Items]          
Collateral amounts 205,000,000 205,000,000      
Accrued interest payable on short-term debt 200,000 200,000      
Unamortized capitalized commitment costs $ 400,000 $ 400,000