ACQUISITIONS - Schedule of Acquisition and Integration Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Provision for credit losses	$ 394	$ (360)	$ 1,431
Salaries and employee benefits	2,549	2,132	2,123
Outside services	700	595	553
Other operating expense	585	411	419
Total acquisition-related costs	2,655	$ 2,977	$ 1,298
Investors Acquisition | Acquisition-related Costs
Business Acquisition [Line Items]
Provision for credit losses	145
Salaries and employee benefits	83
Outside services	61
Mark-to-market losses on LHFS portfolio	31
Other operating expense	15
Total acquisition-related costs	$ 335