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FAIR VALUE MEASUREMENTS - Schedule of Fair Values of Corporation's Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt securities available for sale $ 3,727 $ 3,466
Debt securities held to maturity 3,941 3,644
Net loans and leases, including loans held for sale [1] 85 53
Derivative assets 122 117
Long-term borrowings 641  
Derivative liabilities 208 313
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,498 2,419
Debt securities available for sale 3,727 3,466
Debt securities held to maturity 4,117 3,979
Net loans and leases, including loans held for sale 34,853 33,734
Loan servicing rights 75 72
Derivative assets 122 117
Accrued interest receivable 163 164
Deposits 38,759 37,107
Short-term borrowings 2,017 1,256
Long-term borrowings 1,901 3,012
Derivative liabilities 208 313
Accrued interest payable 50 65
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,498 2,419
Debt securities available for sale 3,727 3,466
Debt securities held to maturity 3,941 3,644
Net loans and leases, including loans held for sale 34,320 32,648
Loan servicing rights 90 88
Derivative assets 122 117
Accrued interest receivable 163 164
Deposits 38,736 37,070
Short-term borrowings 2,018 1,256
Long-term borrowings 1,920 3,004
Derivative liabilities 208 313
Accrued interest payable 50 65
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,498 2,419
Debt securities available for sale 356 274
Debt securities held to maturity 0 1
Net loans and leases, including loans held for sale 0 0
Loan servicing rights 0 0
Derivative assets 0 0
Accrued interest receivable 163 164
Deposits 31,451 29,607
Short-term borrowings 2,018 1,256
Long-term borrowings 0 0
Derivative liabilities 0 0
Accrued interest payable 50 65
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Debt securities available for sale 3,371 3,192
Debt securities held to maturity 3,941 3,643
Net loans and leases, including loans held for sale 514 214
Loan servicing rights 0 0
Derivative assets 115 116
Accrued interest receivable 0 0
Deposits 7,285 7,463
Short-term borrowings 0 0
Long-term borrowings 1,103 1,748
Derivative liabilities 208 309
Accrued interest payable 0 0
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Debt securities available for sale 0 0
Debt securities held to maturity 0 0
Net loans and leases, including loans held for sale 33,806 32,434
Loan servicing rights 90 88
Derivative assets 7 1
Accrued interest receivable 0 0
Deposits 0 0
Short-term borrowings 0 0
Long-term borrowings 817 1,256
Derivative liabilities 0 4
Accrued interest payable $ 0 $ 0
[1] Amount represents loans for which we have elected the fair value option. See Note 25.