NONINTEREST INCOME - Summary of Noninterest Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Noninterest income from contracts with customers	$ 308	$ 222
Noninterest income within the scope of other GAAP topics	191	173
Total noninterest income	$ 499	$ 395