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Fair Value Measurements (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Details) - USD ($)
Jun. 30, 2022
Dec. 31, 2021
Financial Assets [Abstract]    
Debt securities held to maturity, estimated fair value $ 817,000,000 $ 950,000,000
Debt securities available for sale 29,052,000,000 28,481,000,000
Loans held for sale, at fair value 369,000,000 783,000,000
Other earning assets 1,428,000,000 1,187,000,000
Derivative Asset, Fair Value, Gross Asset 1,889,000,000 1,111,000,000
Financial Liabilities [Abstract]    
Derivative Liabilities, Fair Value, Gross Liability 2,426,000,000 1,012,000,000
Fair Value Premium on Loan Portfolio, Amount   $ 220,000,000
Fair Value Premium on Loan Portfolio, Rate   0.30%
Capital leases, carrying amount excluded 1,500,000,000 $ 1,400,000,000
Operating leases, carrying amount excluded   83,000,000
Fair value of loans, discount, amount $ 3,600,000,000  
Fair Value Discount on Loan Portfolio, Rate 4.00%  
Estimate of Fair Value [Member]    
Financial Assets [Abstract]    
Cash and cash equivalents $ 20,500,000,000 29,411,000,000
Debt securities held to maturity, estimated fair value 817,000,000 950,000,000
Debt securities available for sale 29,052,000,000 28,481,000,000
Loans held for sale, at fair value 612,000,000 1,003,000,000
Loans (excluding leases), net of unearned income and allowance for loan losses 86,989,000,000 85,086,000,000
Other earning assets 1,428,000,000 1,104,000,000
Derivative Asset, Fair Value, Gross Asset 1,889,000,000 1,111,000,000
Financial Liabilities [Abstract]    
Derivative Liabilities, Fair Value, Gross Liability 2,426,000,000 1,012,000,000
Deposits 138,213,000,000 139,101,000,000
Long-term borrowings 2,462,000,000 2,847,000,000
Loan commitments and letters of credit 119,000,000 123,000,000
Carrying Amount [Member]    
Financial Assets [Abstract]    
Cash and cash equivalents 20,500,000,000 29,411,000,000
Debt securities held to maturity, estimated fair value 836,000,000 899,000,000
Debt securities available for sale 29,052,000,000 28,481,000,000
Loans held for sale, at fair value 612,000,000 1,003,000,000
Loans (excluding leases), net of unearned income and allowance for loan losses 90,576,000,000 84,866,000,000
Other earning assets 1,428,000,000 1,104,000,000
Derivative Asset, Fair Value, Gross Asset 1,889,000,000 1,111,000,000
Financial Liabilities [Abstract]    
Derivative Liabilities, Fair Value, Gross Liability 2,426,000,000 1,012,000,000
Deposits 138,263,000,000 139,072,000,000
Long-term borrowings 2,319,000,000 2,407,000,000
Loan commitments and letters of credit 119,000,000 123,000,000
Level 1 [Member]    
Financial Assets [Abstract]    
Cash and cash equivalents 20,500,000,000 29,411,000,000
Debt securities held to maturity, estimated fair value 0 0
Debt securities available for sale 1,252,000,000 1,132,000,000
Loans held for sale, at fair value 0 0
Loans (excluding leases), net of unearned income and allowance for loan losses 0 0
Other earning assets 583,000,000 464,000,000
Derivative Asset, Fair Value, Gross Asset 0 0
Financial Liabilities [Abstract]    
Derivative Liabilities, Fair Value, Gross Liability 0 0
Deposits 0 0
Long-term borrowings 0 0
Loan commitments and letters of credit 0 0
Level 2 [Member]    
Financial Assets [Abstract]    
Cash and cash equivalents 0 0
Debt securities held to maturity, estimated fair value 817,000,000 950,000,000
Debt securities available for sale 27,798,000,000 27,347,000,000
Loans held for sale, at fair value 552,000,000 899,000,000
Loans (excluding leases), net of unearned income and allowance for loan losses 0 0
Other earning assets 845,000,000 640,000,000
Derivative Asset, Fair Value, Gross Asset 1,879,000,000 1,098,000,000
Financial Liabilities [Abstract]    
Derivative Liabilities, Fair Value, Gross Liability 2,422,000,000 1,009,000,000
Deposits 138,213,000,000 139,101,000,000
Long-term borrowings 2,460,000,000 2,845,000,000
Loan commitments and letters of credit 0 0
Level 3 [Member]    
Financial Assets [Abstract]    
Cash and cash equivalents 0 0
Debt securities held to maturity, estimated fair value 0 0
Debt securities available for sale 2,000,000 2,000,000
Loans held for sale, at fair value 60,000,000 104,000,000
Loans (excluding leases), net of unearned income and allowance for loan losses 86,989,000,000 85,086,000,000
Other earning assets 0 0
Derivative Asset, Fair Value, Gross Asset 10,000,000 13,000,000
Financial Liabilities [Abstract]    
Derivative Liabilities, Fair Value, Gross Liability 4,000,000 3,000,000
Deposits 0 0
Long-term borrowings 2,000,000 2,000,000
Loan commitments and letters of credit $ 119,000,000 $ 123,000,000