INVESTMENTS - Trading Securities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Net investment gains (losses) recognized during the period on securities held at the end of the period	$ (1)	$ 0	$ 0
Unrealized and realized gains (losses) on trading securities	(1)	0	0
Net investment income (loss) from trading securities	$ (1)	$ 0	$ 0