LOANS AND LEASES - NALs Past Due (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 149,642	$ 130,042
Loans Accounted for Under FVO	167	173
90 or more days past due and accruing	282	239
Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	1,837	1,485
30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	679	603
60-89  Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	291	238
90 or  more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	867	644
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	147,638	128,384
Commercial portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	90,378	73,341
Commercial portfolio | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	69,442	56,809
Loans Accounted for Under FVO	0	0
90 or more days past due and accruing	1	3
Commercial portfolio | Commercial and industrial | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	554	374
Commercial portfolio | Commercial and industrial | 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	144	96
Commercial portfolio | Commercial and industrial | 60-89  Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	78	46
Commercial portfolio | Commercial and industrial | 90 or  more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	332	232
Commercial portfolio | Commercial and industrial | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	68,888	56,435
Commercial portfolio | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	15,209	11,078
Loans Accounted for Under FVO	0	0
90 or more days past due and accruing	0	0
Commercial portfolio | Commercial real estate | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	134	74
Commercial portfolio | Commercial real estate | 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	31	35
Commercial portfolio | Commercial real estate | 60-89  Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	2	0
Commercial portfolio | Commercial real estate | 90 or  more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	101	39
Commercial portfolio | Commercial real estate | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	15,075	11,004
Commercial portfolio | Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	5,727	5,454
Loans Accounted for Under FVO	0	0
90 or more days past due and accruing	9	11
Commercial portfolio | Lease financing | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	72	93
Commercial portfolio | Lease financing | 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	30	56
Commercial portfolio | Lease financing | 60-89  Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	32	23
Commercial portfolio | Lease financing | 90 or  more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	10	14
Commercial portfolio | Lease financing | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	5,655	5,361
Consumer portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	59,264	56,701
Consumer portfolio | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	24,777	24,242
Loans Accounted for Under FVO	167	173
90 or more days past due and accruing	232	185
Consumer portfolio | Residential mortgage | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	644	536
Consumer portfolio | Residential mortgage | 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	239	196
Consumer portfolio | Residential mortgage | 60-89  Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	100	98
Consumer portfolio | Residential mortgage | 90 or  more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	305	242
Consumer portfolio | Residential mortgage | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	23,966	23,533
Consumer portfolio | Automobile
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	16,168	14,564
Loans Accounted for Under FVO	0	0
90 or more days past due and accruing	14	12
Consumer portfolio | Automobile | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	183	160
Consumer portfolio | Automobile | 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	132	117
Consumer portfolio | Automobile | 60-89  Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	33	27
Consumer portfolio | Automobile | 90 or  more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	18	16
Consumer portfolio | Automobile | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	15,985	14,404
Consumer portfolio | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	10,395	10,142
Loans Accounted for Under FVO	0	0
90 or more days past due and accruing	16	20
Consumer portfolio | Home equity | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	179	188
Consumer portfolio | Home equity | 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	60	64
Consumer portfolio | Home equity | 60-89  Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	30	32
Consumer portfolio | Home equity | 90 or  more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	89	92
Consumer portfolio | Home equity | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	10,216	9,954
Consumer portfolio | RV and marine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	5,682	5,982
Loans Accounted for Under FVO	0	0
90 or more days past due and accruing	4	4
Consumer portfolio | RV and marine | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	40	38
Consumer portfolio | RV and marine | 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	25	26
Consumer portfolio | RV and marine | 60-89  Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	10	7
Consumer portfolio | RV and marine | 90 or  more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	5	5
Consumer portfolio | RV and marine | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	5,642	5,944
Consumer portfolio | Consumer loan portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	2,242	1,771
Loans Accounted for Under FVO	0	0
90 or more days past due and accruing	6	4
Consumer portfolio | Consumer loan portfolio | Total
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	31	22
Consumer portfolio | Consumer loan portfolio | 30-59 Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	18	13
Consumer portfolio | Consumer loan portfolio | 60-89  Days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	6	5
Consumer portfolio | Consumer loan portfolio | 90 or  more days
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	7	4
Consumer portfolio | Consumer loan portfolio | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans and Leases	$ 2,211	$ 1,749