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Credit Quality And Allowance For Credit Losses (Loan Modifications Made to Borrowers Experiencing Financial Difficulty) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 75	$ 140
Percent of Total Class	0.14%	0.26%
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 63	$ 100
Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	21
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	5	6
Combination
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 7	13
Business loans:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		$ 137
Percent of Total Class	0.15%	0.28%
Business loans: | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 63	$ 99
Business loans: | Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	21
Business loans: | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	4	5
Business loans: | Combination
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	6	12
Business loans: | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	73
Business loans: | Commercial | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 58	$ 113
Percent of Total Class	0.20%	0.39%
Business loans: | Commercial | Commercial mortgage: | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 7	$ 16
Percent of Total Class	0.05%	0.12%
Business loans: | Commercial | Commercial mortgage: | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 7	$ 16
Percent of Total Class	0.08%	0.18%
Business loans: | Commercial | Real estate construction: | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 8	$ 8
Percent of Total Class	0.17%	0.17%
Business loans: | Commercial | Real estate construction: | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 8	$ 8
Percent of Total Class	1.44%	1.44%
Business loans: | Commercial | Term Extension | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 54	$ 87
Business loans: | Commercial | Term Extension | Commercial mortgage: | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	1	4
Business loans: | Commercial | Term Extension | Commercial mortgage: | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	1	4
Business loans: | Commercial | Term Extension | Real estate construction: | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	8	8
Business loans: | Commercial | Term Extension | Real estate construction: | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	8	8
Business loans: | Commercial | Payment Delay | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	21
Business loans: | Commercial | Payment Delay | Commercial mortgage: | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Business loans: | Commercial | Payment Delay | Commercial mortgage: | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Business loans: | Commercial | Payment Delay | Real estate construction: | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Business loans: | Commercial | Payment Delay | Real estate construction: | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Business loans: | Commercial | Interest Rate Reduction | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	4	4
Business loans: | Commercial | Interest Rate Reduction | Commercial mortgage: | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	1
Business loans: | Commercial | Interest Rate Reduction | Commercial mortgage: | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	1
Business loans: | Commercial | Interest Rate Reduction | Real estate construction: | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Business loans: | Commercial | Interest Rate Reduction | Real estate construction: | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Business loans: | Commercial | Combination | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	1
Business loans: | Commercial | Combination | Commercial mortgage: | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	6	11
Business loans: | Commercial | Combination | Commercial mortgage: | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	6	11
Business loans: | Commercial | Combination | Real estate construction: | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Business loans: | Commercial | Combination | Real estate construction: | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Retail loans:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 2	$ 3
Percent of Total Class	0.05%	0.07%
Retail loans: | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 0	$ 1
Retail loans: | Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Retail loans: | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	1	1
Retail loans: | Combination
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	1	1
Retail loans: | Consumer
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 2	$ 3
Percent of Total Class	0.09%	0.13%
Retail loans: | Consumer | Home equity | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 2	$ 3
Percent of Total Class	0.11%	0.15%
Retail loans: | Consumer | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 0	$ 1
Retail loans: | Consumer | Term Extension | Home equity | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	1
Retail loans: | Consumer | Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Retail loans: | Consumer | Payment Delay | Home equity | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Retail loans: | Consumer | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	1	1
Retail loans: | Consumer | Interest Rate Reduction | Home equity | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	1	1
Retail loans: | Consumer | Combination
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	1	1
Retail loans: | Consumer | Combination | Home equity | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 1	$ 1

X

- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period 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)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

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- Definition

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+ 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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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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