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Short-Term Debt - Additional Information (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Nov. 15, 2018
Nov. 30, 2014
Short-term Debt [Line Items]          
Trading securities pledged as collateral $ 874,000,000 $ 874,000,000      
Average balance of short-term debt 1,860,000,000 1,730,000,000      
Accrued interest payable on short-term debt 5,000,000 5,000,000 $ 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) 4,000,000 4,000,000      
Committed line of credit with financial institutions, outstanding 0 0 $ 0    
Convertible Debt | Exchangeable Senior Notes Due 2019          
Short-term Debt [Line Items]          
Accrued interest payable on short-term debt 1,000,000 1,000,000      
Debt Instrument interest rate     5.625%   5.625%
Unamortized deferred issuance costs     $ 1,000,000    
Sequoia securities | Sequoia Choice          
Short-term Debt [Line Items]          
Trading securities pledged as collateral 148,000,000 148,000,000 130,000,000    
Sequoia securities | Freddie Mac SLST          
Short-term Debt [Line Items]          
Trading securities pledged as collateral 203,000,000 203,000,000 229,000,000    
Sequoia securities | Freddie Mac K-Series          
Short-term Debt [Line Items]          
Trading securities pledged as collateral 207,000,000 207,000,000 18,000,000    
Residential          
Short-term Debt [Line Items]          
Securities pledged as collateral 945,000,000 945,000,000 844,000,000    
Single-family rental loans, held-for-sale at fair value          
Short-term Debt [Line Items]          
Collateral amounts 71,000,000 71,000,000 28,000,000    
Residential bridge loans, held-for-investment at fair value          
Short-term Debt [Line Items]          
Collateral amounts 144,000,000 144,000,000 98,000,000    
Residential Loans          
Short-term Debt [Line Items]          
Servicing Asset at Fair Value, Amount 265,000,000 265,000,000      
Residential Loans          
Short-term Debt [Line Items]          
Loan pledged as collateral 712,000,000 712,000,000 $ 935,000,000    
Servicer advance financing          
Short-term Debt [Line Items]          
Collateral amounts 237,000,000 237,000,000      
Accrued interest payable on short-term debt 300,000 300,000      
Unamortized capitalized commitment costs $ 1,000,000 $ 1,000,000