DERIVATIVES - Effect of Derivative Instruments on Net Income and Stockholders' Equity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Amount of pre-tax net gains (losses) recognized in OCI	$ (1,806)	$ (66)	$ 130
Interest Income
Derivative Instruments, Gain (Loss) [Line Items]
Amount of pre-tax net losses reclassified from AOCI	(111)	183	184
Interest expense - long-term borrowed funds
Derivative Instruments, Gain (Loss) [Line Items]
Amount of pre-tax net losses reclassified from AOCI	$ (4)	$ (48)	$ (35)