INVESTMENT SECURITIES - Gains and Losses Related to Equity Securities (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]
Net (losses) gains recognized on equity securities during the period	$ (62)	$ 62	$ (170)	$ (23)
Less: Net losses recognized on equity securities sold during the period	(2)	0	(61)	0
Unrealized (losses) gains recognized on equity securities still held at the end of the period	$ (60)	$ 62	$ (109)	$ (23)