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Fair Value Measurements (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Financial Assets
Debt securities held to maturity	$ 749	$ 751
Debt securities available for sale	28,230	27,933
Other earning assets	1,335	1,308
Derivative Assets	97	105
Financial Liabilities
Derivative Liabilities	1,206	1,453
Fair value Discount On Loan Portfolio Amount	$ 3,900	$ 4,500
Fair value Discount On Loan Portfolio Rate	4.10%	4.80%
Capital Leases Carrying Amount Excluded	$ 1,500	$ 1,500
Carrying Amount [Member]
Financial Assets
Cash and cash equivalents	8,833	11,227
Debt securities held to maturity	790	801
Debt securities available for sale	28,230	27,933
Loans held for sale	564	354
Loans (excluding leases), net of unearned income and allowance for loan losses	95,095	94,044
Other earning assets	1,335	1,308
Derivative Assets	2,346	2,609
Financial Liabilities
Derivative Liabilities	2,852	3,378
Deposits with no stated maturity, Fair Value Disclosure	120,687	125,971
Time deposits. fair value disclosure	7,773	5,772
Short-term Borrowings	2,000
Long-term Borrowings	2,307	2,284
Loan commitments and letters of credit	156	153
Estimate of Fair Value [Member]
Financial Assets
Cash and cash equivalents	8,833	11,227
Debt securities held to maturity	749	751
Debt securities available for sale	28,230	27,933
Loans held for sale	564	354
Loans (excluding leases), net of unearned income and allowance for loan losses	91,198	89,540
Other earning assets	1,335	1,308
Derivative Assets	2,346	2,609
Financial Liabilities
Derivative Liabilities	2,852	3,378
Deposits with no stated maturity, Fair Value Disclosure	120,687	125,971
Time deposits. fair value disclosure	7,668	5,697
Short-term Borrowings	2,000
Long-term Borrowings	2,301	2,376
Loan commitments and letters of credit	156	153
Level 1 [Member]
Financial Assets
Cash and cash equivalents	8,833	11,227
Debt securities held to maturity	0	0
Debt securities available for sale	1,205	1,187
Loans held for sale	0	0
Loans (excluding leases), net of unearned income and allowance for loan losses	0	0
Other earning assets	650	529
Derivative Assets	0	3
Financial Liabilities
Derivative Liabilities	2	2
Deposits with no stated maturity, Fair Value Disclosure	0	0
Time deposits. fair value disclosure	0	0
Short-term Borrowings	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	749	751
Debt securities available for sale	27,023	26,744
Loans held for sale	545	335
Loans (excluding leases), net of unearned income and allowance for loan losses	0	0
Other earning assets	685	779
Derivative Assets	2,337	2,603
Financial Liabilities
Derivative Liabilities	2,849	3,375
Deposits with no stated maturity, Fair Value Disclosure	120,687	125,971
Time deposits. fair value disclosure	7,668	5,697
Short-term Borrowings	2,000
Long-term Borrowings	2,300	2,375
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
Debt securities available for sale	2	2
Loans held for sale	19	19
Loans (excluding leases), net of unearned income and allowance for loan losses	91,198	89,540
Other earning assets	0	0
Derivative Assets	9	3
Financial Liabilities
Derivative Liabilities	1	1
Deposits with no stated maturity, Fair Value Disclosure	0	0
Time deposits. fair value disclosure	0	0
Short-term Borrowings	0
Long-term Borrowings	1	1
Loan commitments and letters of credit	$ 156	$ 153

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