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Fair Value Measurements (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Financial Assets    
Debt securities held to maturity $ 5,716 $ 4,226
Other earning assets 1,513 1,616
Financial Liabilities    
Fair value Discount On Loan Portfolio Amount $ (2,200) $ (3,500)
Fair value Discount On Loan Portfolio Rate 2.40% 3.80%
Capital Leases Carrying Amount Excluded $ 1,500 $ 1,700
Carrying Amount [Member]    
Financial Assets    
Cash and cash equivalents 12,099 10,712
Debt securities held to maturity 5,769 4,427
Loans held for sale 306 360
Loans (excluding leases), net of unearned income and allowance for loan losses 92,993 93,424
Other earning assets 814 797
Financial Liabilities    
Deposits with no stated maturity, Fair Value Disclosure 115,432 111,883
Time deposits. fair value disclosure 14,902 15,720
Short-term Borrowings 1,300 500
Long-term Borrowings 4,785 5,993
Loan commitments and letters of credit 170 149
Estimate of Fair Value [Member]    
Financial Assets    
Cash and cash equivalents 12,099 10,712
Debt securities held to maturity 5,716 4,226
Loans held for sale 306 360
Loans (excluding leases), net of unearned income and allowance for loan losses 90,783 89,907
Other earning assets 814 797
Financial Liabilities    
Deposits with no stated maturity, Fair Value Disclosure 115,432 111,883
Time deposits. fair value disclosure 14,891 15,694
Short-term Borrowings 1,300 500
Long-term Borrowings 4,962 6,059
Loan commitments and letters of credit 170 149
Level 1 [Member]    
Financial Assets    
Cash and cash equivalents 12,099 10,712
Debt securities held to maturity 0 0
Loans held for sale 0 0
Loans (excluding leases), net of unearned income and allowance for loan losses 0 0
Other earning assets 0 0
Financial Liabilities    
Deposits with no stated maturity, Fair Value Disclosure 0 0
Time deposits. fair value disclosure 0 0
Short-term Borrowings 0 0
Long-term Borrowings 0 0
Loan commitments and letters of credit 0 0
Level 2 [Member]    
Financial Assets    
Cash and cash equivalents 0 0
Debt securities held to maturity 5,716 4,226
Loans held for sale 251 360
Loans (excluding leases), net of unearned income and allowance for loan losses 0 0
Other earning assets 814 797
Financial Liabilities    
Deposits with no stated maturity, Fair Value Disclosure 115,432 111,883
Time deposits. fair value disclosure 14,891 15,694
Short-term Borrowings 1,300 500
Long-term Borrowings 4,961 6,058
Loan commitments and letters of credit 0 0
Level 3 [Member]    
Financial Assets    
Cash and cash equivalents 0 0
Debt securities held to maturity 0 0
Loans held for sale 55 0
Loans (excluding leases), net of unearned income and allowance for loan losses 90,783 89,907
Other earning assets 0 0
Financial Liabilities    
Deposits with no stated maturity, Fair Value Disclosure 0 0
Time deposits. fair value disclosure 0 0
Short-term Borrowings 0 0
Long-term Borrowings 1 1
Loan commitments and letters of credit $ 170 $ 149