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Loans And The Allowance For Credit Losses(Aging and Non-Accrual Performance for Modifications to Troubled Borrowers (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	$ 421	$ 773
Defaulted during period as modification to troubled borrower, twelve months prior to modification	24	79
Commercial
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	96	347
Investor Real Estate
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	118	300
Consumer
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	207	126
Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	294	451
Current | Commercial
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	74	162
Current | Investor Real Estate
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	64	192
Current | Consumer
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	156	97
Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	29	14
Financial Asset, 30 to 89 Days Past Due | Commercial
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	3	0
Financial Asset, 30 to 89 Days Past Due | Investor Real Estate
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Financial Asset, 30 to 89 Days Past Due | Consumer
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	26	14
Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	15	8
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Investor Real Estate
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due | Consumer
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	15	8
Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	83	300
Non-performing [Member] | Commercial
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	19	185
Non-performing [Member] | Investor Real Estate
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	54	108
Non-performing [Member] | Consumer
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	10	7
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	93	345
Commercial And Industrial [Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	72	161
Commercial And Industrial [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	3	0
Commercial And Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Commercial And Industrial [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	18	184
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	3	2
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	2	1
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Commercial Real Estate Mortgage - Owner-Occupied [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	1	1
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0
Commercial Real Estate Construction - Owner-Occupied [Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0
Commercial Real Estate Construction - Owner-Occupied [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0
Commercial Real Estate Construction - Owner-Occupied [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0
Commercial Real Estate Construction - Owner-Occupied [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0
Commercial investor real estate mortgage [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	118	300
Commercial investor real estate mortgage [Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	64	192
Commercial investor real estate mortgage [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Commercial investor real estate mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Commercial investor real estate mortgage [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	54	108
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	185	113
Residential First Mortgage [Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	138	87
Residential First Mortgage [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	25	13
Residential First Mortgage [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	15	8
Residential First Mortgage [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	7	5
Home Equity Lines of Credit[Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	11	4
Home Equity Lines of Credit[Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	10	4
Home Equity Lines of Credit[Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Home Equity Lines of Credit[Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Home Equity Lines of Credit[Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	1	0
Home Equity Loan [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	11	9
Home Equity Loan [Member] | Current
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	8	6
Home Equity Loan [Member] | Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	1	1
Home Equity Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	0	0
Home Equity Loan [Member] | Non-performing [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period	$ 2	$ 2

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