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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning	$ 24,302	$ 20,757	$ 22,084	$ 21,361
Purchases	3,279	1,395	9,395	3,634
Sales	(846)	(136)	(1,957)	(993)
Repayments	(1,663)	(1,029)	(4,718)	(3,024)
PIK interest and dividends	111	74	329	255
Net accretion of discount on investments	3	1	7	7
Net transfers in and/or out of Level 3	(83)	(24)	(83)	(197)
Balance at the end	25,156	21,198	25,156	21,198
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)	$ (20)	$ (86)	$ (33)	$ (174)
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)	$ 73	$ 246	$ 132	$ 329
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):