FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Changes in Investments that use Level 3 Inputs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at the beginning	$ 22,353	$ 20,683	$ 22,084	$ 21,361
Purchases	3,245	1,167	6,116	2,239
Sales	(60)	(160)	(1,111)	(857)
Repayments	(1,301)	(932)	(3,055)	(1,995)
PIK interest and dividends	128	100	218	181
Net accretion of discount on investments	3	2	4	6
Net transfers in and/or out of Level 3	0	(129)	0	(173)
Balance at the end	24,302	20,757	24,302	20,757
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)	$ (15)	$ (68)	$ (13)	$ (88)
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)	$ (51)	$ 94	$ 59	$ 83
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):