FAIR VALUE OF FINANCIAL INSTRUMENTS - Changes in Investments that use Level 3 Inputs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning	$ 22,084	$ 21,361
Purchases	12,716	5,585
Sales	(2,650)	(1,532)
Repayments	(6,543)	(3,707)
PIK interest and dividends	461	354
Net accretion of discount on investments	9	10
Net transfers in and/or out of Level 3	(61)	(271)
Balance at the end	26,091	22,084
Debt and Equity Securities, Realized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized (losses) gains and unrealized gains (losses)	$ 64	$ (173)
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):
Debt and Equity Securities, Unrealized Gain (Loss)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Net realized (losses) gains and unrealized gains (losses)	$ 139	$ 457
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):