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FAIR VALUE OF FINANCIAL INSTRUMENTS - Narrative (Details) - Level 3 - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Unrealized appreciation (depreciation) on investments $ 403 $ 345
Net unrealized gains (losses) $ (78) $ 118