v3.26.1
FAIR VALUE - Schedule of Carrying Values and Estimated Fair Values for Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Financial Assets    
Investment in marketable equity securities $ 130 $ 127
Investment securities available for sale 33,314 31,790
Investment securities held to maturity 9,542 9,647
Fair value of derivative financial instruments 498 534
Financial Liabilities    
Fair value of derivative financial instruments 448 494
Carrying Value    
Financial Assets    
Cash and due from banks 1,080 801
Interest-earning deposits at banks 23,189 19,801
Securities purchased under agreements to resell 223 232
Investment in marketable equity securities 130 127
Investment securities available for sale 33,314 31,790
Investment securities held to maturity 9,542 9,647
Loans held for sale 1,118 799
Net loans 145,170 144,346
Accrued interest receivable 955 912
Federal Home Loan Bank stock 20 20
Mortgage servicing rights 33 32
Financial Liabilities    
Deposits with no stated maturity 157,599 150,342
Time deposits 13,243 11,236
Credit balances of factoring clients 1,284 1,148
Securities sold under customer repurchase agreements 170 224
Long-term borrowings 33,719 35,712
Accrued interest payable 109 140
Carrying Value | Non-qualifying Hedges    
Financial Assets    
Fair value of derivative financial instruments 498 534
Financial Liabilities    
Fair value of derivative financial instruments 448 494
Estimated Fair Value    
Financial Assets    
Cash and due from banks 1,080 801
Interest-earning deposits at banks 23,189 19,801
Securities purchased under agreements to resell 223 232
Investment in marketable equity securities 130 127
Investment securities available for sale 33,314 31,790
Investment securities held to maturity 8,360 8,491
Loans held for sale 1,118 799
Net loans 146,194 145,362
Accrued interest receivable 955 912
Federal Home Loan Bank stock 20 20
Mortgage servicing rights 54 50
Financial Liabilities    
Deposits with no stated maturity 157,599 150,342
Time deposits 13,223 11,227
Credit balances of factoring clients 1,284 1,148
Securities sold under customer repurchase agreements 170 224
Long-term borrowings 33,641 35,795
Accrued interest payable 109 140
Estimated Fair Value | Level 1    
Financial Assets    
Cash and due from banks 1,080 801
Interest-earning deposits at banks 23,189 19,801
Securities purchased under agreements to resell 0 0
Investment in marketable equity securities 50 50
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 223 232
Investment in marketable equity securities 80 77
Investment securities available for sale 33,294 31,767
Investment securities held to maturity 8,360 8,491
Loans held for sale 733 781
Net loans 1,487 1,580
Accrued interest receivable 955 912
Federal Home Loan Bank stock 20 20
Mortgage servicing rights 0 0
Financial Liabilities    
Deposits with no stated maturity 157,599 150,342
Time deposits 13,223 11,227
Credit balances of factoring clients 0 0
Securities sold under customer repurchase agreements 170 224
Long-term borrowings 33,641 35,795
Accrued interest payable 109 140
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 20 23
Investment securities held to maturity 0 0
Loans held for sale 385 18
Net loans 144,707 143,782
Accrued interest receivable 0 0
Federal Home Loan Bank stock 0 0
Mortgage servicing rights 54 50
Financial Liabilities    
Deposits with no stated maturity 0 0
Time deposits 0 0
Credit balances of factoring clients 1,284 1,148
Securities sold under customer repurchase agreements 0 0
Long-term borrowings 0 0
Accrued interest payable 0 0
Estimated Fair Value | Non-qualifying Hedges    
Financial Assets    
Fair value of derivative financial instruments 498 534
Financial Liabilities    
Fair value of derivative financial instruments 448 494
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 467 505
Financial Liabilities    
Fair value of derivative financial instruments 448 494
Estimated Fair Value | Non-qualifying Hedges | Level 3    
Financial Assets    
Fair value of derivative financial instruments 31 29
Financial Liabilities    
Fair value of derivative financial instruments $ 0 $ 0