INVESTMENTS - Trading Securities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 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	$ (16)	$ (49)
Net investment gains (losses) recognized on securities sold during the period	0	22
Unrealized and realized gains (losses) on trading securities	(16)	(27)
Interest and dividend income from trading securities	2	36
Net investment income (loss) from trading securities	$ (14)	$ 9