INVESTMENTS - Trading Securities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Net investment gains (losses) recognized during the period on securities held at the end of the period	$ (264)	$ 96	$ 422
Net investment gains (losses) recognized on securities sold during the period	206	10	7
Unrealized and realized gains (losses) on trading securities	(58)	106	429
Interest and dividend income from trading securities	92	206	283
Net investment income (loss) from trading securities	$ 34	$ 312	$ 712