LOANS AND LEASES - Schedule of Loans Charge-offs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			$ 34	$ 9
Year two			65	79
Year three			90	134
Year four			98	48
Year five			18	28
Prior year			49	96
Revolving			212	69
Revolving Converted to Term Loans			1	1
Total	$ 256	$ 177	567	464
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			34	9
Year two			62	76
Year three			87	132
Year four			96	46
Year five			17	28
Prior year			43	94
Revolving			200	57
Revolving Converted to Term Loans			1	1
Total	244	169	540	443
Commercial | Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			0
Year two			0
Year three			0
Year four			1
Year five			0
Prior year			0
Revolving			0
Revolving Converted to Term Loans			0
Total			1
Commercial | Owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			0	0
Year two			2	0
Year three			0	0
Year four			0	0
Year five			0	0
Prior year			1	8
Revolving			0	0
Revolving Converted to Term Loans			0	0
Total			3	8
Commercial | Non-owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			4	0
Year two			23	0
Year three			3	0
Year four			20	0
Year five			0	19
Prior year			32	70
Revolving			0	0
Revolving Converted to Term Loans			0	0
Total			82	89
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			28	8
Year two			20	35
Year three			51	65
Year four			44	15
Year five			9	4
Prior year			3	10
Revolving			191	50
Revolving Converted to Term Loans			1	1
Total			347	188
Commercial | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			2	1
Year two			3	4
Year three			3	4
Year four			3	4
Year five			1	2
Prior year			3	2
Revolving			0	0
Revolving Converted to Term Loans			0	0
Total			15	17
Commercial | Investor dependent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			0	0
Year two			14	37
Year three			30	63
Year four			28	27
Year five			7	3
Prior year			4	4
Revolving			9	7
Revolving Converted to Term Loans			0	0
Total			92	141
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			0	0
Year two			3	3
Year three			3	2
Year four			2	2
Year five			1	0
Prior year			6	2
Revolving			12	12
Revolving Converted to Term Loans			0	0
Total	$ 12	$ 8	27	21
Consumer | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			0	0
Year two			0	0
Year three			0	0
Year four			0	0
Year five			0	0
Prior year			6	1
Revolving			0	0
Revolving Converted to Term Loans			0	0
Total			6	1
Consumer | Consumer auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			0	0
Year two			2	2
Year three			2	1
Year four			1	1
Year five			1	0
Prior year			0	0
Revolving			0	0
Revolving Converted to Term Loans			0	0
Total			6	4
Consumer | Consumer other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			0	0
Year two			1	1
Year three			1	1
Year four			1	1
Year five			0	0
Prior year			0	1
Revolving			12	12
Revolving Converted to Term Loans			0	0
Total			$ 15	$ 16