INVESTMENT SECURITIES - Gains and Losses Related to Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]
Net (losses) gains recognized on equity securities during the period	$ 0	$ (62)	$ 1	$ (170)
Less: Net (losses) gains recognized on equity securities sold during the period	0	(2)	1	(61)
Unrealized losses recognized on equity securities still held at the end of the period	$ 0	$ (60)	$ 0	$ (109)