LOANS AND LEASES - Schedule of Loans Charge-offs (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			$ 16	$ 4
Year two			44	49
Year three			61	88
Year four			80	32
Year five			14	7
Prior year			27	60
Revolving			68	46
Revolving Converted to Term Loans			1	1
Total	$ 144	$ 159	311	287
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			16	4
Year two			42	47
Year three			59	86
Year four			78	31
Year five			14	7
Prior year			27	60
Revolving			59	38
Revolving Converted to Term Loans			1	1
Total	137	153	296	274
Commercial | Owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			0
Year two			0
Year three			0
Year four			0
Year five			0
Prior year			1
Revolving			0
Revolving Converted to Term Loans			0
Total			1
Commercial | Non-owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			0	0
Year two			23	0
Year three			2	0
Year four			17	0
Year five			0	0
Prior year			17	46
Revolving			0	0
Revolving Converted to Term Loans			0	0
Total			59	46
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			15	4
Year two			11	18
Year three			32	39
Year four			33	7
Year five			6	2
Prior year			3	8
Revolving			56	33
Revolving Converted to Term Loans			1	1
Total			157	112
Commercial | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			1	0
Year two			2	6
Year three			2	10
Year four			2	5
Year five			2	2
Prior year			2	2
Revolving			0	0
Revolving Converted to Term Loans			0	0
Total			11	25
Commercial | Investor dependent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			0	0
Year two			6	23
Year three			23	37
Year four			26	19
Year five			6	3
Prior year			4	4
Revolving			3	5
Revolving Converted to Term Loans			0	0
Total			68	91
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Year one			0	0
Year two			2	2
Year three			2	2
Year four			2	1
Year five			0	0
Prior year			0	0
Revolving			9	8
Revolving Converted to Term Loans			0	0
Total	$ 7	$ 6	15	13
Consumer | Consumer auto
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	0
Revolving			0	0
Revolving Converted to Term Loans			0	0
Total			3	3
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	0
Year five			0	0
Prior year			0	0
Revolving			9	8
Revolving Converted to Term Loans			0	0
Total			$ 12	$ 10