Loans and Related Allowance for Credit Losses (Financial Effect of Loan Modification) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2023	Jun. 30, 2023
Total commercial \| Commercial and industrial
Financing Receivable [Line Items]
Weighted-Average Term Extension (in Months)	9 months	10 months
Weighted-Average Payment Delay (in Months)	10 months	6 months
Total commercial \| Commercial and industrial \| Principal Forgiveness
Financing Receivable [Line Items]
Total Principal Forgiveness		$ 2
Total commercial \| Commercial real estate
Financing Receivable [Line Items]
Weighted-Average Term Extension (in Months)	20 months	17 months
Total consumer \| Residential real estate
Financing Receivable [Line Items]
Weighted-Average Interest Rate Reduction	1.17%	1.34%
Weighted-Average Term Extension (in Months)	123 months	111 months
Weighted-Average Payment Delay (in Months)	8 months	8 months
Total consumer \| Home equity
Financing Receivable [Line Items]
Weighted-Average Interest Rate Reduction	1.29%	1.41%
Weighted-Average Term Extension (in Months)	66 months	58 months
Weighted-Average Payment Delay (in Months)	3 months	4 months
Total consumer \| Education
Financing Receivable [Line Items]
Weighted-Average Term Extension (in Months)	19 months	17 months

Financing Receivable, Modified, Weighted Average Payment Delay

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- Definition

Amount of increase (decrease) in amortized cost excluding accrued interest, of financing receivable modified for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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-Section 50
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-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
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-Section 55
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-URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 33
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-34

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- Definition

Percentage of decrease in weighted average contractual interest rate of financing receivable modified for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A

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- Definition

Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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