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Allowance For Credit Losses (Aging and NonAccrual Performance for Modifications to Troubled Borrowers (Details) $ in Millions	Mar. 31, 2023 USD ($)
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	$ 197
Modifications to troubled borrowers, modified in the previous 12-month period, Nonaccrual	15
Modifications to troubled borrowers, modified in the previous 12-month period, Total	212
Financial Asset, 30 to 89 Days Past Due
Financing Receivable, Modifications [Line Items]
Modifications to troubled borrowers, modified in the previous 12-month period, Past Due between 30&89 Days	0
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, Equal to or Greater than 90Days Past Due	0
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	169
Modifications to troubled borrowers, modified in the previous 12-month period, Nonaccrual	13
Modifications to troubled borrowers, modified in the previous 12-month period, Total	182
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, Past Due between 30&89 Days	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, Equal to or Greater than 90Days Past Due	0
Commercial Real Estate Mortgage - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	2
Modifications to troubled borrowers, modified in the previous 12-month period, Nonaccrual	0
Modifications to troubled borrowers, modified in the previous 12-month period, Total	2
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, Past Due between 30&89 Days	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, Equal to or Greater than 90Days Past Due	0
Commercial Real Estate Construction - Owner-Occupied [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	0
Modifications to troubled borrowers, modified in the previous 12-month period, Nonaccrual	1
Modifications to troubled borrowers, modified in the previous 12-month period, Total	1
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, Past Due between 30&89 Days	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, Equal to or Greater than 90Days Past Due	0
Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	171
Modifications to troubled borrowers, modified in the previous 12-month period, Nonaccrual	14
Modifications to troubled borrowers, modified in the previous 12-month period, Total	185
Commercial Portfolio Segment [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, Past Due between 30&89 Days	0
Commercial Portfolio Segment [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, Equal to or Greater than 90Days Past Due	0
Residential First Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	23
Modifications to troubled borrowers, modified in the previous 12-month period, Nonaccrual	1
Modifications to troubled borrowers, modified in the previous 12-month period, Total	24
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, Past Due between 30&89 Days	0
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, Equal to or Greater than 90Days Past Due	0
Home Equity Lines of Credit[Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	1
Modifications to troubled borrowers, modified in the previous 12-month period, Nonaccrual	0
Modifications to troubled borrowers, modified in the previous 12-month period, Total	1
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, Past Due between 30&89 Days	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, Equal to or Greater than 90Days Past Due	0
Home Equity Loan [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	2
Modifications to troubled borrowers, modified in the previous 12-month period, Nonaccrual	0
Modifications to troubled borrowers, modified in the previous 12-month period, Total	2
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, Past Due between 30&89 Days	0
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, Equal to or Greater than 90Days Past Due	0
Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Modifications to Troubled Borrowers, modified in the previous 12-month period, Current	26
Modifications to troubled borrowers, modified in the previous 12-month period, Nonaccrual	1
Modifications to troubled borrowers, modified in the previous 12-month period, Total	27
Consumer Portfolio Segment [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, Past Due between 30&89 Days	0
Consumer Portfolio Segment [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, Equal to or Greater than 90Days Past Due	$ 0

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Modifications to Troubled Borrowers, modified in the previous 12-month period, Current

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