INVESTMENTS - Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Net investment gains (losses) recognized during the period on securities held at the end of the period	$ (11)	$ (31)	$ (5)	$ (138)
Net investment gains (losses) recognized on securities sold during the period	(6)	(2)	(8)	(12)
Unrealized and realized gains (losses) on equity securities	$ (17)	$ (33)	$ (13)	$ (150)