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LOANS, LEASES, AND ALLOWANCE FOR CREDIT LOSSES (Summary of Selected Information on Modified Loans) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Financing Receivable, Modifications [Line Items]
Amortized cost basis	$ 216	$ 108	$ 504	$ 240
Percentage of total loans	0.40%	0.20%	0.80%	0.40%
Unfunded lending commitments on troubled debt restructuring	$ 29	$ 8	$ 29	$ 8
Interest rate reduction
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0	9	0	9
Maturity or term extension
Financing Receivable, Modifications [Line Items]
Amortized cost basis	210	49	479	166
Principal forgiveness
Financing Receivable, Modifications [Line Items]
Amortized cost basis	2	0	2	2
Payment deferral
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0	1	8	2
Multiple modification types
Financing Receivable, Modifications [Line Items]
Amortized cost basis	4	49	15	61
Commercial:
Financing Receivable, Modifications [Line Items]
Amortized cost basis	$ 81		$ 131	$ 81
Percentage of total loans	0.30%		0.40%	0.30%
Commercial: | Interest rate reduction
Financing Receivable, Modifications [Line Items]
Amortized cost basis	$ 0		$ 0	$ 9
Commercial: | Maturity or term extension
Financing Receivable, Modifications [Line Items]
Amortized cost basis	81		131	48
Commercial: | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0		0	0
Commercial: | Payment deferral
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0		0	2
Commercial: | Multiple modification types
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0		0	22
Commercial: | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Amortized cost basis	$ 58	$ 34	$ 106	$ 77
Percentage of total loans	0.30%	0.20%	0.60%	0.50%
Commercial: | Commercial and industrial | Interest rate reduction
Financing Receivable, Modifications [Line Items]
Amortized cost basis	$ 0	$ 9	$ 0	$ 9
Commercial: | Commercial and industrial | Maturity or term extension
Financing Receivable, Modifications [Line Items]
Amortized cost basis	58	11	106	44
Commercial: | Commercial and industrial | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0	0	0	0
Commercial: | Commercial and industrial | Payment deferral
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0	1	0	2
Commercial: | Commercial and industrial | Multiple modification types
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0	13	0	22
Commercial: | Owner-occupied
Financing Receivable, Modifications [Line Items]
Amortized cost basis	$ 23		$ 25	$ 1
Percentage of total loans	0.20%		0.30%	0.00%
Commercial: | Owner-occupied | Interest rate reduction
Financing Receivable, Modifications [Line Items]
Amortized cost basis	$ 0		$ 0	$ 0
Commercial: | Owner-occupied | Maturity or term extension
Financing Receivable, Modifications [Line Items]
Amortized cost basis	23		25	1
Commercial: | Owner-occupied | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0		0	0
Commercial: | Owner-occupied | Payment deferral
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0		0	0
Commercial: | Owner-occupied | Multiple modification types
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0		0	0
Commercial: | Municipal
Financing Receivable, Modifications [Line Items]
Amortized cost basis				$ 3
Percentage of total loans				0.10%
Commercial: | Municipal | Interest rate reduction
Financing Receivable, Modifications [Line Items]
Amortized cost basis				$ 0
Commercial: | Municipal | Maturity or term extension
Financing Receivable, Modifications [Line Items]
Amortized cost basis				3
Commercial: | Municipal | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Amortized cost basis				0
Commercial: | Municipal | Payment deferral
Financing Receivable, Modifications [Line Items]
Amortized cost basis				0
Commercial: | Municipal | Multiple modification types
Financing Receivable, Modifications [Line Items]
Amortized cost basis				0
Commercial real estate:
Financing Receivable, Modifications [Line Items]
Amortized cost basis	$ 129	$ 74	$ 363	$ 153
Percentage of total loans	1.00%	0.50%	2.70%	1.10%
Commercial real estate: | Interest rate reduction
Financing Receivable, Modifications [Line Items]
Amortized cost basis	$ 0	$ 0	$ 0	$ 0
Commercial real estate: | Maturity or term extension
Financing Receivable, Modifications [Line Items]
Amortized cost basis	129	38	348	117
Commercial real estate: | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0	0	0	0
Commercial real estate: | Payment deferral
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0	0	8	0
Commercial real estate: | Multiple modification types
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0	36	7	36
Commercial real estate: | Term
Financing Receivable, Modifications [Line Items]
Amortized cost basis	$ 128	$ 69	$ 337	$ 146
Percentage of total loans	1.20%	0.60%	3.10%	1.40%
Commercial real estate: | Term | Interest rate reduction
Financing Receivable, Modifications [Line Items]
Amortized cost basis	$ 0	$ 0	$ 0	$ 0
Commercial real estate: | Term | Maturity or term extension
Financing Receivable, Modifications [Line Items]
Amortized cost basis	128	33	322	110
Commercial real estate: | Term | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0	0	0	0
Commercial real estate: | Term | Payment deferral
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0	0	8	0
Commercial real estate: | Term | Multiple modification types
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0	36	7	36
Commercial real estate: | Construction and land development
Financing Receivable, Modifications [Line Items]
Amortized cost basis	$ 1	$ 5	$ 26	$ 7
Percentage of total loans	0.00%	0.20%	1.10%	0.20%
Commercial real estate: | Construction and land development | Interest rate reduction
Financing Receivable, Modifications [Line Items]
Amortized cost basis	$ 0	$ 0	$ 0	$ 0
Commercial real estate: | Construction and land development | Maturity or term extension
Financing Receivable, Modifications [Line Items]
Amortized cost basis	1	5	26	7
Commercial real estate: | Construction and land development | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0	0	0	0
Commercial real estate: | Construction and land development | Payment deferral
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0	0	0	0
Commercial real estate: | Construction and land development | Multiple modification types
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0	$ 0	0	0
Consumer:
Financing Receivable, Modifications [Line Items]
Amortized cost basis			$ 10	$ 6
Percentage of total loans			0.10%	0.00%
Consumer: | Interest rate reduction
Financing Receivable, Modifications [Line Items]
Amortized cost basis			$ 0	$ 0
Consumer: | Maturity or term extension
Financing Receivable, Modifications [Line Items]
Amortized cost basis			0	1
Consumer: | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Amortized cost basis			2	2
Consumer: | Payment deferral
Financing Receivable, Modifications [Line Items]
Amortized cost basis			0	0
Consumer: | Multiple modification types
Financing Receivable, Modifications [Line Items]
Amortized cost basis			8	3
Consumer: | 1-4 family residential
Financing Receivable, Modifications [Line Items]
Amortized cost basis	$ 6		$ 9	$ 4
Percentage of total loans	0.10%		0.10%	0.00%
Consumer: | 1-4 family residential | Interest rate reduction
Financing Receivable, Modifications [Line Items]
Amortized cost basis	$ 0		$ 0	$ 0
Consumer: | 1-4 family residential | Maturity or term extension
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0		0	0
Consumer: | 1-4 family residential | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Amortized cost basis	2		2	2
Consumer: | 1-4 family residential | Payment deferral
Financing Receivable, Modifications [Line Items]
Amortized cost basis	0		0	0
Consumer: | 1-4 family residential | Multiple modification types
Financing Receivable, Modifications [Line Items]
Amortized cost basis	$ 4		7	2
Consumer: | Home equity credit line
Financing Receivable, Modifications [Line Items]
Amortized cost basis			$ 1	$ 1
Percentage of total loans			0.00%	0.00%
Consumer: | Home equity credit line | Interest rate reduction
Financing Receivable, Modifications [Line Items]
Amortized cost basis			$ 0	$ 0
Consumer: | Home equity credit line | Maturity or term extension
Financing Receivable, Modifications [Line Items]
Amortized cost basis			0	0
Consumer: | Home equity credit line | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Amortized cost basis			0	0
Consumer: | Home equity credit line | Payment deferral
Financing Receivable, Modifications [Line Items]
Amortized cost basis			0	0
Consumer: | Home equity credit line | Multiple modification types
Financing Receivable, Modifications [Line Items]
Amortized cost basis			$ 1	1
Consumer: | Other
Financing Receivable, Modifications [Line Items]
Amortized cost basis				$ 1
Percentage of total loans				0.80%
Consumer: | Other | Interest rate reduction
Financing Receivable, Modifications [Line Items]
Amortized cost basis				$ 0
Consumer: | Other | Maturity or term extension
Financing Receivable, Modifications [Line Items]
Amortized cost basis				1
Consumer: | Other | Principal forgiveness
Financing Receivable, Modifications [Line Items]
Amortized cost basis				0
Consumer: | Other | Payment deferral
Financing Receivable, Modifications [Line Items]
Amortized cost basis				0
Consumer: | Other | Multiple modification types
Financing Receivable, Modifications [Line Items]
Amortized cost basis				$ 0

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