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FAIR VALUE OF FINANCIAL INSTRUMENTS - Changes in Investments that use Level 3 Inputs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at the beginning $ 27,126 $ 24,302 $ 26,091 $ 22,084
Purchases 3,379 3,279 8,788 9,395
Sales (687) (846) (2,151) (1,957)
Repayments (2,130) (1,663) (5,038) (4,718)
PIK interest and dividends 108 111 363 329
Net accretion of discount on investments 2 3 7 7
Transfers into Level 3 0 0 0 0
Transfers out of Level 3 0 (83) (212) (83)
Balance at the end 27,855 25,156 27,855 25,156
Debt and Equity Securities, Realized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net realized gains (losses) and unrealized gains (losses) $ 245 $ (20) $ 252 $ (33)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net realized gains (losses): Net realized gains (losses): Net realized gains (losses): Net realized gains (losses):
Debt and Equity Securities, Unrealized Gain (Loss)        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Net realized gains (losses) and unrealized gains (losses) $ (188) $ 73 $ (245) $ 132
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net unrealized gains (losses): Net unrealized gains (losses): Net unrealized gains (losses): Net unrealized gains (losses):