Quarterly report pursuant to Section 13 or 15(d)

TRANSACTIONS WITH AFFILIATES AND AFFILIATED ENTITIES - Narrative (Details)

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TRANSACTIONS WITH AFFILIATES AND AFFILIATED ENTITIES - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended
Mar. 31, 2020
USD ($)
purchasers
Mar. 31, 2020
USD ($)
purchasers
Related Party Transaction [Line Items]    
Management agreement, renewal term (in years)   1 year
Termination fee, number of months' pay (in months)   12 months
Proportion of directors' votes needed to terminate   0.6667
Number of purchasers | purchasers 6 6
Mortgage-backed securities $ 6,100 $ 6,100
Proceeds from sale of mortgage-backed securities $ 3,300  
Manager    
Related Party Transaction [Line Items]    
Management fee rate (percent) 1.50% 1.50%
Incentive compensation percentage 25.00% 25.00%
Interest rate for incentive compensation 10.00% 10.00%
Fortress Purchaser    
Related Party Transaction [Line Items]    
Mortgage-backed securities $ 1,850 $ 1,850
Payments to acquire mortgage-backed securities $ 1,000