NONINTEREST INCOME - Summary of Noninterest Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue from Contract with Customer [Abstract]
Noninterest income from contracts with customers	$ 332	$ 322	$ 709	$ 630
Noninterest income within the scope of other GAAP topics	163	163	298	354
Total noninterest income	$ 495	$ 485	$ 1,007	$ 984