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FAIR VALUE - Schedule of Carrying Values and Estimated Fair Values for Financial Instruments (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Financial Assets    
Investment in marketable equity securities $ 127 $ 101
Investment securities available for sale 31,790 33,750
Investment securities held to maturity 9,647 10,239
Fair value of derivative financial instruments 534 660
Financial Liabilities    
Fair value of derivative financial instruments 494 625
Carrying Value    
Financial Assets    
Cash and due from banks 801 814
Interest-earning deposits at banks 19,801 21,364
Securities purchased under agreements to resell 232 158
Investment in marketable equity securities 127 101
Investment securities available for sale 31,790 33,750
Investment securities held to maturity 9,647 10,239
Loans held for sale 799 82
Net loans 144,346 136,567
Accrued interest receivable 912 902
Federal Home Loan Bank stock 20 20
Mortgage servicing rights 32 27
Financial Liabilities    
Deposits with no stated maturity 150,342 141,976
Time deposits 11,236 13,253
Credit balances of factoring clients 1,148 1,016
Securities sold under customer repurchase agreements 224 367
Long-term borrowings 35,712 36,669
Accrued interest payable 140 134
Carrying Value | Qualifying Hedges    
Financial Assets    
Fair value of derivative financial instruments   1
Carrying Value | Non-qualifying Hedges    
Financial Assets    
Fair value of derivative financial instruments 534 659
Financial Liabilities    
Fair value of derivative financial instruments 494 625
Estimated Fair Value    
Financial Assets    
Cash and due from banks 801 814
Interest-earning deposits at banks 19,801 21,364
Securities purchased under agreements to resell 232 158
Investment in marketable equity securities 127 101
Investment securities available for sale 31,790 33,750
Investment securities held to maturity 8,491 8,702
Loans held for sale 799 82
Net loans 145,362 134,872
Accrued interest receivable 912 902
Federal Home Loan Bank stock 20 20
Mortgage servicing rights 50 47
Financial Liabilities    
Deposits with no stated maturity 150,342 141,976
Time deposits 11,227 13,247
Credit balances of factoring clients 1,148 1,016
Securities sold under customer repurchase agreements 224 367
Long-term borrowings 35,795 36,220
Accrued interest payable 140 134
Estimated Fair Value | Level 1    
Financial Assets    
Cash and due from banks 801 814
Interest-earning deposits at banks 19,801 21,364
Securities purchased under agreements to resell 0 0
Investment in marketable equity securities 50 48
Investment securities available for sale 0 0
Investment securities held to maturity 0 0
Loans held for sale 0 0
Net loans 0 0
Accrued interest receivable 0 0
Federal Home Loan Bank stock 0 0
Mortgage servicing rights 0 0
Financial Liabilities    
Deposits with no stated maturity 0 0
Time deposits 0 0
Credit balances of factoring clients 0 0
Securities sold under customer repurchase agreements 0 0
Long-term borrowings 0 0
Accrued interest payable 0 0
Estimated Fair Value | Level 2    
Financial Assets    
Cash and due from banks 0 0
Interest-earning deposits at banks 0 0
Securities purchased under agreements to resell 232 158
Investment in marketable equity securities 77 53
Investment securities available for sale 31,767 33,582
Investment securities held to maturity 8,491 8,702
Loans held for sale 781 55
Net loans 1,580 1,463
Accrued interest receivable 912 902
Federal Home Loan Bank stock 20 20
Mortgage servicing rights 0 0
Financial Liabilities    
Deposits with no stated maturity 150,342 141,976
Time deposits 11,227 13,247
Credit balances of factoring clients 0 0
Securities sold under customer repurchase agreements 224 367
Long-term borrowings 35,795 36,220
Accrued interest payable 140 134
Estimated Fair Value | Level 3    
Financial Assets    
Cash and due from banks 0 0
Interest-earning deposits at banks 0 0
Securities purchased under agreements to resell 0 0
Investment in marketable equity securities 0 0
Investment securities available for sale 23 168
Investment securities held to maturity 0 0
Loans held for sale 18 27
Net loans 143,782 133,409
Accrued interest receivable 0 0
Federal Home Loan Bank stock 0 0
Mortgage servicing rights 50 47
Financial Liabilities    
Deposits with no stated maturity 0 0
Time deposits 0 0
Credit balances of factoring clients 1,148 1,016
Securities sold under customer repurchase agreements 0 0
Long-term borrowings 0 0
Accrued interest payable 0 0
Estimated Fair Value | Qualifying Hedges    
Financial Assets    
Fair value of derivative financial instruments   1
Estimated Fair Value | Qualifying Hedges | Level 1    
Financial Assets    
Fair value of derivative financial instruments   0
Estimated Fair Value | Qualifying Hedges | Level 2    
Financial Assets    
Fair value of derivative financial instruments   1
Estimated Fair Value | Qualifying Hedges | Level 3    
Financial Assets    
Fair value of derivative financial instruments   0
Estimated Fair Value | Non-qualifying Hedges    
Financial Assets    
Fair value of derivative financial instruments 534 659
Financial Liabilities    
Fair value of derivative financial instruments 494 625
Estimated Fair Value | Non-qualifying Hedges | Level 1    
Financial Assets    
Fair value of derivative financial instruments 0 0
Financial Liabilities    
Fair value of derivative financial instruments 0 0
Estimated Fair Value | Non-qualifying Hedges | Level 2    
Financial Assets    
Fair value of derivative financial instruments 505 642
Financial Liabilities    
Fair value of derivative financial instruments 494 624
Estimated Fair Value | Non-qualifying Hedges | Level 3    
Financial Assets    
Fair value of derivative financial instruments 29 17
Financial Liabilities    
Fair value of derivative financial instruments $ 0 $ 1