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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
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Mar. 31, 2025 | Mar. 31, 2024
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  | $ 89 |  | $ 127
Percent of Total Class |  | 0.18% |  | 0.25%
Weighted-Average Interest Rate Reduction |  | (3.24%) |  | 1.40%
Weighted-Average Term Extension (in months) |  | 1 year 6 months 4 days |  | 11 months 5 days
Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total | [1] | $ 88 |  | $ 115
Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  | 1 |  | 1
Combination |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total | [2] | 0 |  | 11
Business loans: |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  | $ 88 |  | $ 124
Percent of Total Class |  | 0.19% |  | 0.27%
Weighted-Average Interest Rate Reduction |  | 0.00% |  | 1.11%
Weighted-Average Term Extension (in months) |  | 1 year 6 months 4 days |  | 9 months 29 days
Business loans: | Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total | [1] | $ 88 |  | $ 114
Business loans: | Term Extension | International |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total | [1] |  |  | 1
Business loans: | Interest Rate Reduction |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  | 0 |  | 0
Business loans: | Interest Rate Reduction | International |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  |  |  | 0
Business loans: | Combination |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total | [2] | $ 0 |  | 10
Business loans: | Combination | International |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total | [2] |  |  | $ 0
Business loans: | Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction |  | 0.00% |  | 1.11%
Weighted-Average Term Extension (in months) |  | 1 year 4 months 2 days |  | 9 months 26 days
Business loans: | Commercial | Domestic |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  | $ 44 |  | $ 118
Percent of Total Class |  | 0.17% |  | 0.45%
Business loans: | Commercial | International |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  |  |  | $ 1
Percent of Total Class |  |  |  | 0.13%
Business loans: | Commercial | Commercial mortgage: |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction |  | 0.00% |  | 0.00%
Weighted-Average Term Extension (in months) |  | 1 year 8 months 5 days |  | 1 year 11 days
Business loans: | Commercial | Commercial mortgage: | Domestic |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  | $ 44 |  | $ 5
Percent of Total Class |  | 0.30% |  | 0.04%
Business loans: | Commercial | Commercial mortgage: | Other business lines |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction | [3] | 0.00% |  | 0.00%
Weighted-Average Term Extension (in months) | [3] | 1 year 5 months 12 days |  | 1 year 11 days
Business loans: | Commercial | Commercial mortgage: | Other business lines | Domestic |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total | [3] | $ 10 |  | $ 5
Percent of Total Class | [3] | 0.12% |  | 0.06%
Business loans: | Commercial | Commercial mortgage: | Commercial |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction |  | 0.00% |  |
Business loans: | Commercial | Term Extension | Domestic |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total | [1] | $ 44 |  | $ 108
Business loans: | Commercial | Term Extension | Commercial mortgage: | Domestic |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total | [1] | 44 |  | 5
Business loans: | Commercial | Term Extension | Commercial mortgage: | Other business lines | Domestic |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total | [1],[3] | 10 |  | 5
Business loans: | Commercial | Term Extension | Commercial mortgage: | Commercial | Domestic |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  | 34 |  |
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 |  | 0 |  | 0
Business loans: | Commercial | Interest Rate Reduction | Commercial mortgage: | Other business lines | Domestic |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total | [3] | 0 |  | 0
Business loans: | Commercial | Combination | Domestic |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total | [2] | 0 |  | 10
Business loans: | Commercial | Combination | Commercial mortgage: | Domestic |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total | [2] | 0 |  | 0
Business loans: | Commercial | Combination | Commercial mortgage: | Other business lines | Domestic |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total | [2],[3] | 0 |  | 0
Retail loans: |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  | $ 1 |  | $ 3
Percent of Total Class |  | 0.03% |  | 0.05%
Retail loans: | Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  | $ 0 | [1] | $ 1
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 |  | 0 | [2] | 1
Retail loans: | Consumer |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  | $ 1 |  | $ 3
Percent of Total Class |  | 0.06% |  | 0.10%
Weighted-Average Interest Rate Reduction |  | 3.24% |  | 3.11%
Weighted-Average Term Extension (in months) |  |  |  | 9 years 9 months 15 days
Retail loans: | Consumer | Home equity |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction |  | (3.24%) |  | (3.11%)
Weighted-Average Term Extension (in months) |  |  |  | 9 years 9 months 15 days
Retail loans: | Consumer | Home equity | Other business lines | Domestic |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  | $ 1 |  | $ 3
Percent of Total Class |  | 0.07% |  | 0.12%
Retail loans: | Consumer | Consumer Loan |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Weighted-Average Interest Rate Reduction |  | 3.24% |  | 3.11%
Weighted-Average Term Extension (in months) |  |  |  | 9 years 9 months 15 days
Retail loans: | Consumer | Term Extension |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  | $ 0 | [1] | $ 1
Retail loans: | Consumer | Term Extension | Home equity | Other business lines | Domestic |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  | 0 | [1] | 1
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 |  |
Retail loans: | Consumer | Combination |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  | 0 | [2] | 1
Retail loans: | Consumer | Combination | Home equity | Other business lines | Domestic |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  | $ 0 | [2] | 1
Retail loans: | Consumer | Payment Delay | Home equity | Other business lines | Domestic |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Total |  |  |  | $ 1
[1] | Represents loan balances where terms were extended or payments were delayed by a more than an insignificant time period, typically more than 180 days, at or above contractual interest rates.
[2] | Relates to FDMs where more than one type of modification was made. For three months ended March 31, 2024, this primarily related to modifications where the interest rate was reduced and the term was extended. (c)Primarily loans to real estate developers.
[3] | Primarily loans secured by owner-occupied real estate.

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- 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 + Details
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