FAIR VALUE OF ASSETS AND LIABILITIES - Schedule of Changes in Fair Value (Details) - Insurance Liabilities - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Retained Business
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	$ 2,835	$ 2,941
Reduction in estimates of ultimate losses	(385)	(348)
Increase in estimates of ultimate losses	108	132
Change in fair value (discount rate)	(245)	235
Fee income and paid losses	29	100
Other	0	(4)
Fair Value, end of period	2,342	3,056
Ceded Business
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Fair Value, beginning of period	2,168	2,605
Reduction in estimates of ultimate losses	(96)	(66)
Increase in estimates of ultimate losses	159	67
Change in fair value (discount rate)	(31)	76
Fee income and paid losses	3	13
Other	0	0
Fair Value, end of period	$ 2,203	$ 2,695