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Loans And The Allowance For Credit Losses (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable no allowance	$ 173		$ 173		$ 119
Loans, net of unearned income	96,125		96,125		96,727
Defaulted during period as modification to troubled borrower, twelve months prior to modification	26	$ 49	74	$ 183
Unfunded Loan Commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Excluding Accrued Interest, Modified, Accumulated	118		118		71
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	54,354		54,354		54,845
Investor Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	9,070		9,070		8,710
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	32,701		32,701		33,172
Collateral Dependent Member | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	381		381		264
Collateral Dependent Member | Investor Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	134		134		323
Collateral Dependent Member | Consumer | residential real estate and home equity loan and lines
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income	$ 117		$ 117		$ 115

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