LOANS AND LEASES - Schedule of Loans Disaggregated by Year of Origination and by Risk Rating (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 147,930	$ 140,221	$ 133,302
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	23,821	21,997
Term loans by origination year, year two	17,214	16,270
Term loans by origination year, year three	11,387	14,172
Term loans by origination year, year four	9,341	8,472
Term loans by origination year, year five	6,021	5,785
Prior year	8,744	8,104
Revolving	44,061	37,434
Revolving Converted to Term Loans	145	143
Total loans and leases	120,734	112,377
Commercial \| Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	22,286	21,427
Term loans by origination year, year two	16,013	15,144
Term loans by origination year, year three	10,351	12,250
Term loans by origination year, year four	8,251	7,516
Term loans by origination year, year five	5,332	5,283
Prior year	8,124	6,640
Revolving	43,207	36,429
Revolving Converted to Term Loans	137	138
Total loans and leases	113,701	104,827
Commercial \| Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	470	196
Term loans by origination year, year two	395	474
Term loans by origination year, year three	302	688
Term loans by origination year, year four	219	409
Term loans by origination year, year five	169	76
Prior year	118	240
Revolving	202	238
Revolving Converted to Term Loans	0	0
Total loans and leases	1,875	2,321
Commercial \| Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	1,005	342
Term loans by origination year, year two	764	605
Term loans by origination year, year three	681	1,162
Term loans by origination year, year four	813	524
Term loans by origination year, year five	509	422
Prior year	480	1,217
Revolving	475	532
Revolving Converted to Term Loans	8	5
Total loans and leases	4,735	4,809
Commercial \| Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	60	32
Term loans by origination year, year two	42	47
Term loans by origination year, year three	53	72
Term loans by origination year, year four	58	23
Term loans by origination year, year five	11	4
Prior year	22	7
Revolving	34	101
Revolving Converted to Term Loans	0	0
Total loans and leases	280	286
Commercial \| Ungraded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	0	0
Term loans by origination year, year two	0	0
Term loans by origination year, year three	0	0
Term loans by origination year, year four	0	0
Term loans by origination year, year five	0	0
Prior year	0	0
Revolving	143	134
Revolving Converted to Term Loans	0	0
Total loans and leases	143	134
Commercial \| Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	14,166	13,575
Term loans by origination year, year two	8,490	7,181
Term loans by origination year, year three	3,907	5,760
Term loans by origination year, year four	3,570	3,001
Term loans by origination year, year five	1,928	1,482
Prior year	1,664	1,694
Revolving	10,915	10,793
Revolving Converted to Term Loans	81	73
Total loans and leases	44,721	43,559
Commercial \| Commercial and industrial \| Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	13,484	13,235
Term loans by origination year, year two	7,906	6,531
Term loans by origination year, year three	3,552	4,814
Term loans by origination year, year four	2,963	2,329
Term loans by origination year, year five	1,428	1,242
Prior year	1,539	1,394
Revolving	10,143	9,898
Revolving Converted to Term Loans	76	69
Total loans and leases	41,091	39,512
Commercial \| Commercial and industrial \| Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	213	157
Term loans by origination year, year two	264	253
Term loans by origination year, year three	113	281
Term loans by origination year, year four	97	302
Term loans by origination year, year five	143	33
Prior year	60	68
Revolving	181	203
Revolving Converted to Term Loans	0	0
Total loans and leases	1,071	1,297
Commercial \| Commercial and industrial \| Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	451	177
Term loans by origination year, year two	296	371
Term loans by origination year, year three	215	621
Term loans by origination year, year four	475	353
Term loans by origination year, year five	347	205
Prior year	65	231
Revolving	416	461
Revolving Converted to Term Loans	5	4
Total loans and leases	2,270	2,423
Commercial \| Commercial and industrial \| Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	18	6
Term loans by origination year, year two	24	26
Term loans by origination year, year three	27	44
Term loans by origination year, year four	35	17
Term loans by origination year, year five	10	2
Prior year	0	1
Revolving	32	97
Revolving Converted to Term Loans	0	0
Total loans and leases	146	193
Commercial \| Commercial and industrial \| Ungraded
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	0	0
Term loans by origination year, year two	0	0
Term loans by origination year, year three	0	0
Term loans by origination year, year four	0	0
Term loans by origination year, year five	0	0
Prior year	0	0
Revolving	143	134
Revolving Converted to Term Loans	0	0
Total loans and leases	143	134
Commercial \| Capital call lines
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	0	0
Term loans by origination year, year two	0	0
Term loans by origination year, year three	0	0
Term loans by origination year, year four	0	0
Term loans by origination year, year five	0	0
Prior year	0	0
Revolving	31,758	25,467
Revolving Converted to Term Loans	33	34
Total loans and leases	31,791	25,501
Commercial \| Capital call lines \| Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	0	0
Term loans by origination year, year two	0	0
Term loans by origination year, year three	0	0
Term loans by origination year, year four	0	0
Term loans by origination year, year five	0	0
Prior year	0	0
Revolving	31,758	25,467
Revolving Converted to Term Loans	33	34
Total loans and leases	31,791	25,501
Commercial \| Owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	2,883	2,773
Term loans by origination year, year two	2,832	2,525
Term loans by origination year, year three	2,364	2,953
Term loans by origination year, year four	2,687	2,721
Term loans by origination year, year five	2,402	2,304
Prior year	4,203	3,294
Revolving	258	242
Revolving Converted to Term Loans	31	30
Total loans and leases	17,660	16,842
Commercial \| Owner occupied commercial mortgage \| Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	2,816	2,721
Term loans by origination year, year two	2,739	2,445
Term loans by origination year, year three	2,177	2,747
Term loans by origination year, year four	2,430	2,581
Term loans by origination year, year five	2,290	2,199
Prior year	3,954	2,988
Revolving	248	223
Revolving Converted to Term Loans	28	29
Total loans and leases	16,682	15,933
Commercial \| Owner occupied commercial mortgage \| Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	26	22
Term loans by origination year, year two	34	46
Term loans by origination year, year three	49	70
Term loans by origination year, year four	78	58
Term loans by origination year, year five	24	32
Prior year	27	61
Revolving	2	9
Revolving Converted to Term Loans	0	0
Total loans and leases	240	298
Commercial \| Owner occupied commercial mortgage \| Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	41	30
Term loans by origination year, year two	55	34
Term loans by origination year, year three	128	136
Term loans by origination year, year four	179	82
Term loans by origination year, year five	88	73
Prior year	222	245
Revolving	8	10
Revolving Converted to Term Loans	3	1
Total loans and leases	724	611
Commercial \| Owner occupied commercial mortgage \| Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	0
Term loans by origination year, year two	4
Term loans by origination year, year three	10
Term loans by origination year, year four	0
Term loans by origination year, year five	0
Prior year	0
Revolving	0
Revolving Converted to Term Loans	0
Total loans and leases	14
Commercial \| Investor dependent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	1,127	1,300
Term loans by origination year, year two	901	860
Term loans by origination year, year three	244	550
Term loans by origination year, year four	105	73
Term loans by origination year, year five	4	1
Prior year	0	0
Revolving	397	406
Revolving Converted to Term Loans	0	3
Total loans and leases	2,778	3,193
Commercial \| Investor dependent \| Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	981	1,135
Term loans by origination year, year two	648	640
Term loans by origination year, year three	110	352
Term loans by origination year, year four	67	37
Term loans by origination year, year five	0	0
Prior year	0	0
Revolving	326	315
Revolving Converted to Term Loans	0	3
Total loans and leases	2,132	2,482
Commercial \| Investor dependent \| Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	29	17
Term loans by origination year, year two	78	28
Term loans by origination year, year three	1	6
Term loans by origination year, year four	19	0
Term loans by origination year, year five	0	0
Prior year	0	0
Revolving	19	26
Revolving Converted to Term Loans	0	0
Total loans and leases	146	77
Commercial \| Investor dependent \| Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	104	122
Term loans by origination year, year two	164	173
Term loans by origination year, year three	117	164
Term loans by origination year, year four	14	31
Term loans by origination year, year five	4	1
Prior year	0	0
Revolving	50	61
Revolving Converted to Term Loans	0	0
Total loans and leases	453	552
Commercial \| Investor dependent \| Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	13	26
Term loans by origination year, year two	11	19
Term loans by origination year, year three	16	28
Term loans by origination year, year four	5	5
Term loans by origination year, year five	0	0
Prior year	0	0
Revolving	2	4
Revolving Converted to Term Loans	0	0
Total loans and leases	47	82
Commercial \| Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	5,645	4,349
Term loans by origination year, year two	4,991	5,704
Term loans by origination year, year three	4,872	4,909
Term loans by origination year, year four	2,979	2,677
Term loans by origination year, year five	1,687	1,998
Prior year	2,877	3,116
Revolving	733	526
Revolving Converted to Term Loans	0	3
Total loans and leases	23,784	23,282
Commercial \| Commercial real estate \| Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	5,005	4,336
Term loans by origination year, year two	4,720	5,528
Term loans by origination year, year three	4,512	4,337
Term loans by origination year, year four	2,791	2,569
Term loans by origination year, year five	1,614	1,842
Prior year	2,631	2,258
Revolving	732	526
Revolving Converted to Term Loans	0	3
Total loans and leases	22,005	21,399
Commercial \| Commercial real estate \| Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	202	0
Term loans by origination year, year two	19	147
Term loans by origination year, year three	139	331
Term loans by origination year, year four	25	49
Term loans by origination year, year five	2	11
Prior year	31	111
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	418	649
Commercial \| Commercial real estate \| Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	409	13
Term loans by origination year, year two	249	27
Term loans by origination year, year three	221	241
Term loans by origination year, year four	145	58
Term loans by origination year, year five	70	143
Prior year	193	741
Revolving	1	0
Revolving Converted to Term Loans	0	0
Total loans and leases	1,288	1,223
Commercial \| Commercial real estate \| Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	29	0
Term loans by origination year, year two	3	2
Term loans by origination year, year three	0	0
Term loans by origination year, year four	18	1
Term loans by origination year, year five	1	2
Prior year	22	6
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	73	11
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	2,290	2,797
Term loans by origination year, year two	2,131	3,348
Term loans by origination year, year three	2,820	5,612
Term loans by origination year, year four	5,049	5,355
Term loans by origination year, year five	4,852	3,026
Prior year	6,549	4,597
Revolving	3,351	2,982
Revolving Converted to Term Loans	154	127
Total loans and leases	27,196	27,844
Consumer \| Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	1,605	2,027
Term loans by origination year, year two	1,619	2,841
Term loans by origination year, year three	2,533	5,230
Term loans by origination year, year four	4,834	5,166
Term loans by origination year, year five	4,757	2,951
Prior year	6,509	4,549
Revolving	4	4
Revolving Converted to Term Loans	0	0
Total loans and leases	21,861	22,768
Consumer \| Residential mortgage \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	1,601	2,024
Term loans by origination year, year two	1,609	2,824
Term loans by origination year, year three	2,512	5,202
Term loans by origination year, year four	4,783	5,135
Term loans by origination year, year five	4,715	2,910
Prior year	6,295	4,353
Revolving	2	4
Revolving Converted to Term Loans	0	0
Total loans and leases	21,517	22,452
Consumer \| Residential mortgage \| 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	3	2
Term loans by origination year, year two	4	13
Term loans by origination year, year three	12	18
Term loans by origination year, year four	32	23
Term loans by origination year, year five	32	31
Prior year	94	95
Revolving	2	0
Revolving Converted to Term Loans	0	0
Total loans and leases	179	182
Consumer \| Residential mortgage \| 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	0	1
Term loans by origination year, year two	1	2
Term loans by origination year, year three	3	4
Term loans by origination year, year four	9	2
Term loans by origination year, year five	3	1
Prior year	38	28
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	54	38
Consumer \| Residential mortgage \| 90 Days or Greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	1	0
Term loans by origination year, year two	5	2
Term loans by origination year, year three	6	6
Term loans by origination year, year four	10	6
Term loans by origination year, year five	7	9
Prior year	82	73
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	111	96
Consumer \| Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	0	0
Term loans by origination year, year two	0	0
Term loans by origination year, year three	0	0
Term loans by origination year, year four	0	0
Term loans by origination year, year five	0	0
Prior year	0	0
Revolving	2,709	2,440
Revolving Converted to Term Loans	154	127
Total loans and leases	2,863	2,567
Consumer \| Revolving mortgage \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	0	0
Term loans by origination year, year two	0	0
Term loans by origination year, year three	0	0
Term loans by origination year, year four	0	0
Term loans by origination year, year five	0	0
Prior year	0	0
Revolving	2,686	2,420
Revolving Converted to Term Loans	125	108
Total loans and leases	2,811	2,528
Consumer \| Revolving mortgage \| 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	0	0
Term loans by origination year, year two	0	0
Term loans by origination year, year three	0	0
Term loans by origination year, year four	0	0
Term loans by origination year, year five	0	0
Prior year	0	0
Revolving	20	16
Revolving Converted to Term Loans	9	6
Total loans and leases	29	22
Consumer \| Revolving mortgage \| 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	0	0
Term loans by origination year, year two	0	0
Term loans by origination year, year three	0	0
Term loans by origination year, year four	0	0
Term loans by origination year, year five	0	0
Prior year	0	0
Revolving	0	1
Revolving Converted to Term Loans	6	5
Total loans and leases	6	6
Consumer \| Revolving mortgage \| 90 Days or Greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	0	0
Term loans by origination year, year two	0	0
Term loans by origination year, year three	0	0
Term loans by origination year, year four	0	0
Term loans by origination year, year five	0	0
Prior year	0	0
Revolving	3	3
Revolving Converted to Term Loans	14	8
Total loans and leases	17	11
Consumer \| Auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	507	622
Term loans by origination year, year two	411	363
Term loans by origination year, year three	222	282
Term loans by origination year, year four	162	159
Term loans by origination year, year five	80	69
Prior year	34	28
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	1,416	1,523
Consumer \| Auto \| Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	504	617
Term loans by origination year, year two	405	358
Term loans by origination year, year three	217	277
Term loans by origination year, year four	157	155
Term loans by origination year, year five	77	68
Prior year	33	27
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	1,393	1,502
Consumer \| Auto \| 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	3	3
Term loans by origination year, year two	4	3
Term loans by origination year, year three	3	3
Term loans by origination year, year four	3	2
Term loans by origination year, year five	2	1
Prior year	1	1
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	16	13
Consumer \| Auto \| 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	0	1
Term loans by origination year, year two	1	1
Term loans by origination year, year three	1	1
Term loans by origination year, year four	1	1
Term loans by origination year, year five	1	0
Prior year	0	0
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	4	4
Consumer \| Auto \| 90 Days or Greater
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	0	1
Term loans by origination year, year two	1	1
Term loans by origination year, year three	1	1
Term loans by origination year, year four	1	1
Term loans by origination year, year five	0	0
Prior year	0	0
Revolving	0	0
Revolving Converted to Term Loans	0	0
Total loans and leases	3	4
Consumer \| Other consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Term loans by origination year, year one	178	148

LOANS AND LEASES - Schedule of Loans Disaggregated by Year of Origination and by Risk Rating (Details) - USD ($)
$ in Millions

Dec. 31, 2025

Dec. 31, 2024

Dec. 31, 2023

Accounts, Notes, Loans and Financing Receivable [Line Items]

Total loans and leases

$ 147,930

$ 140,221

$ 133,302

Commercial

Accounts, Notes, Loans and Financing Receivable [Line Items]

Term loans by origination year, year one