ALLOWANCE FOR LOAN AND LEASE LOSSES - Schedule of Allowance for Loan and Lease Losses (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan and lease losses, beginning balance	$ 1,680	$ 1,737	$ 1,676	$ 1,747
Provision for loan and lease losses	111	95	259	188
Charge-offs	(144)	(159)	(311)	(287)
Recoveries	25	27	48	52
Allowance for loan and lease losses, ending balance	1,672	1,700	1,672	1,700
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan and lease losses, beginning balance	1,517	1,582	1,518	1,581
Provision for loan and lease losses	111	94	249	193
Charge-offs	(137)	(153)	(296)	(274)
Recoveries	21	24	41	47
Allowance for loan and lease losses, ending balance	1,512	1,547	1,512	1,547
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan and lease losses, beginning balance	163	155	158	166
Provision for loan and lease losses	0	1	10	(5)
Charge-offs	(7)	(6)	(15)	(13)
Recoveries	4	3	7	5
Allowance for loan and lease losses, ending balance	$ 160	$ 153	$ 160	$ 153