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INVESTMENTS - Amortized Cost and Fair Value of the Investment in IHAM (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Amortized Cost $ 26,777.5 [1] $ 26,374.0 [2]
Fair Value 27,130.3 [1] 26,719.9 [2]
Ivy Hill Asset Management, L.P.    
Schedule of Investments [Line Items]    
Amortized Cost 2,419.0 2,237.0
Fair Value 9,349.0 8,172.0
Ivy Hill Asset Management, L.P.    
Schedule of Investments [Line Items]    
Amortized Cost 1,701.0 1,701.0
Fair Value 1,920.0 1,915.0
Equity    
Schedule of Investments [Line Items]    
Amortized Cost 1,701.0 1,701.0
Fair Value $ 1,920.0 $ 1,915.0
[1] As of March 31, 2025, the estimated net unrealized gain for federal tax purposes was $0.4 billion based on a tax cost basis of $26.7 billion. As of March 31, 2025, the estimated aggregate gross unrealized gain for federal income tax purposes was $1.7 billion and the estimated aggregate gross unrealized loss for federal income tax purposes was $1.3 billion.
[2] As of December 31, 2024, the estimated net unrealized gain for federal tax purposes was $0.2 billion based on a tax cost basis of $26.5 billion. As of December 31, 2024, the estimated aggregate gross unrealized gain for federal income tax purposes was $1.7 billion and the estimated aggregate gross unrealized loss for federal income tax purposes was $1.5 billion.