v3.26.1
Fair Value Measurement (Schedule Of Fair Value Assets And Liabilities Measured On Recurring Basis) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale $ 10,915 $ 11,112
Loans held for sale 81 262
Loans Receivable, Fair Value Disclosure 79 78
Residential mortgage servicing rights, at fair value 105 99
Derivative Asset 81 84
Total assets measured at fair value 11,354 11,717
Junior subordinated debentures, at fair value 333 338
Derivative Liability 181 179
Total liabilities measured at fair value 514 517
Investments in mutual funds and other securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity and Other Investment Securities, Excluding Investments Measured At Net Asset Value Per Share 73 63
Equity securities held in rabbi trusts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity and Other Investment Securities, Excluding Investments Measured At Net Asset Value Per Share 20 19
U.S. Treasury and agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 1,190 1,300
Obligations of states and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 1,583 1,629
Mortgage-backed securities and collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 8,142 8,183
Interest rate futures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability 3  
Interest rate forward sales commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 1  
Interest rate swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 80 84
Derivative Liability 178 179
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale 0 0
Loans Receivable, Fair Value Disclosure 0 0
Residential mortgage servicing rights, at fair value 0 0
Total assets measured at fair value 277 291
Junior subordinated debentures, at fair value 0 0
Total liabilities measured at fair value 3 0
Level 1 | Investments in mutual funds and other securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity and Other Investment Securities, Excluding Investments Measured At Net Asset Value Per Share 73 63
Level 1 | Equity securities held in rabbi trusts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity and Other Investment Securities, Excluding Investments Measured At Net Asset Value Per Share 20 19
Level 1 | U.S. Treasury and agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 184 209
Level 1 | Obligations of states and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Level 1 | Mortgage-backed securities and collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Level 1 | Interest rate futures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability 3  
Level 1 | Interest rate forward sales commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0  
Level 1 | Interest rate swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0 0
Derivative Liability 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale 81 262
Loans Receivable, Fair Value Disclosure 79 78
Residential mortgage servicing rights, at fair value 0 0
Total assets measured at fair value 10,972 11,327
Junior subordinated debentures, at fair value 0 0
Total liabilities measured at fair value 178 179
Level 2 | Investments in mutual funds and other securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity and Other Investment Securities, Excluding Investments Measured At Net Asset Value Per Share 0 0
Level 2 | Equity securities held in rabbi trusts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity and Other Investment Securities, Excluding Investments Measured At Net Asset Value Per Share 0 0
Level 2 | U.S. Treasury and agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 1,006 1,091
Level 2 | Obligations of states and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 1,583 1,629
Level 2 | Mortgage-backed securities and collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 8,142 8,183
Level 2 | Interest rate futures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability 0  
Level 2 | Interest rate forward sales commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 1  
Level 2 | Interest rate swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 80 84
Derivative Liability 178 179
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Loans held for sale 0 0
Loans Receivable, Fair Value Disclosure 0 0
Residential mortgage servicing rights, at fair value 105 99
Total assets measured at fair value 105 99
Junior subordinated debentures, at fair value 333 338
Total liabilities measured at fair value 333 338
Level 3 | Investments in mutual funds and other securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity and Other Investment Securities, Excluding Investments Measured At Net Asset Value Per Share 0 0
Level 3 | Equity securities held in rabbi trusts    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity and Other Investment Securities, Excluding Investments Measured At Net Asset Value Per Share 0 0
Level 3 | U.S. Treasury and agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Level 3 | Obligations of states and political subdivisions    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Level 3 | Mortgage-backed securities and collateralized mortgage obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available for sale 0 0
Level 3 | Interest rate futures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Liability 0  
Level 3 | Interest rate forward sales commitments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0  
Level 3 | Interest rate swaps    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative Asset 0 0
Derivative Liability $ 0 $ 0