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FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Assets $ 112,141,892 $ 103,556,384 [1] $ 93,668,577
Liabilities 98,667,529 90,859,432 [1]  
Total securities      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Assets 73,500,626 69,756,447  
Agency mortgage-backed securities, recognized through comprehensive income      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Assets 7,402,350 8,234,911  
Agency mortgage-backed securities, recognized through earnings      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Assets 64,354,288 59,199,157  
Residential credit risk transfer securities      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Assets 414,047 754,915  
Non-agency mortgage-backed securities      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Assets 1,329,941 1,493,186  
Commercial real estate debt investments - CMBS      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Assets 0 74,278  
Residential mortgage loans      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Assets 3,722,272 3,546,902  
Residential mortgage loans      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Assets 27,021,790 21,973,188  
Repurchase agreements      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Liabilities 66,541,378 65,688,923  
Other secured financing      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Liabilities 1,025,000 750,000  
Debt issued by securitization vehicles      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Liabilities 24,107,249 19,540,678  
Participations issued      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Liabilities 1,556,900 1,154,816  
U.S. Treasury securities sold, not yet purchased      
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]      
Liabilities $ 2,528,167 $ 2,470,629  
[1]
(1)Derived from the audited consolidated financial statements at December 31, 2024.