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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	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 52	$ 66
Percent of Total Class	0.09%	0.12%
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 27	$ 35
Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	22	22
Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	2	2
Combination
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	1	7
Business loans:
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 52	$ 66
Percent of Total Class	0.10%	0.13%
Business loans: | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Percent of Total Class	0.10%	0.10%
Business loans: | International
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 1	$ 1
Business loans: | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	27	35
Business loans: | Term Extension | International
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Business loans: | Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	22	22
Business loans: | Payment Delay | International
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Business loans: | Interest Rate Reduction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	2	2
Business loans: | Interest Rate Reduction | International
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Business loans: | Combination
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	1	7
Business loans: | Combination | International
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	1	1
Business loans: | Commercial | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 47	$ 53
Percent of Total Class	0.15%	0.17%
Business loans: | Commercial | Commercial mortgage: | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 4	$ 12
Percent of Total Class	0.03%	0.08%
Business loans: | Commercial | Commercial mortgage: | Commercial | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		$ 1
Percent of Total Class		0.02%
Business loans: | Commercial | Commercial mortgage: | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 4	$ 11
Percent of Total Class	0.05%	0.11%
Business loans: | Commercial | Term Extension | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 25	$ 30
Business loans: | Commercial | Term Extension | Commercial mortgage: | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	2	5
Business loans: | Commercial | Term Extension | Commercial mortgage: | Commercial | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		1
Business loans: | Commercial | Term Extension | Commercial mortgage: | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	2	4
Business loans: | Commercial | Payment Delay | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	22	22
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: | Commercial | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		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 | Interest Rate Reduction | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	0	0
Business loans: | Commercial | Interest Rate Reduction | Commercial mortgage: | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	2	2
Business loans: | Commercial | Interest Rate Reduction | Commercial mortgage: | Commercial | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		0
Business loans: | Commercial | Interest Rate Reduction | Commercial mortgage: | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	2	2
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	0	5
Business loans: | Commercial | Combination | Commercial mortgage: | Commercial | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total		0
Business loans: | Commercial | Combination | Commercial mortgage: | Other business lines | Domestic
Financing Receivable, Troubled Debt Restructuring [Line Items]
Total	$ 0	$ 5

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)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
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-Section 50
-Paragraph 42
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