BUSINESS OPERATING SEGMENTS - Narrative (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) segment	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting [Abstract]
Business operating segments | segment	3
Segment Reporting Information [Line Items]
Revenues	$ 8,224,000,000	$ 8,021,000,000	$ 6,647,000,000
Consumer Banking | Maximum
Segment Reporting Information [Line Items]
Revenues	25,000,000
Commercial Banking | Minimum
Segment Reporting Information [Line Items]
Revenues	25,000,000
Commercial Banking | Maximum
Segment Reporting Information [Line Items]
Revenues	$ 3,000,000,000