ALLOWANCE FOR LOAN AND LEASE LOSSES - Schedule of Allowance for Loan and Lease Losses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan and lease losses, beginning balance	$ 1,676	$ 1,747	$ 922
Initial PCD ALLL	0	0	220
Day 2 Provision for Loan and Lease Losses	0	0	462
Provision (benefit) for loan and lease losses	530	469	703
Provision for credit losses	530	469	1,165
Charge-offs	(741)	(657)	(638)
Recoveries	101	117	78
Allowance for loan and lease losses, ending balance	1,566	1,676	1,747
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan and lease losses, beginning balance	1,518	1,581	789
Initial PCD ALLL	0	0	217
Day 2 Provision for Loan and Lease Losses	0	0	419
Provision (benefit) for loan and lease losses	538	461	701
Provision for credit losses	538	461	1,120
Charge-offs	(708)	(627)	(610)
Recoveries	88	103	65
Allowance for loan and lease losses, ending balance	1,436	1,518	1,581
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan and lease losses, beginning balance	158	166	133
Initial PCD ALLL	0	0	3
Day 2 Provision for Loan and Lease Losses	0	0	43
Provision (benefit) for loan and lease losses	(8)	8	2
Provision for credit losses	(8)	8	45
Charge-offs	(33)	(30)	(28)
Recoveries	13	14	13
Allowance for loan and lease losses, ending balance	$ 130	$ 158	$ 166