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Credit Quality And Allowance For Credit Losses (Nonaccrual Loans) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Nonaccrual Loans with No Related Allowance |  | $ 91 |  | $ 91 |  | $ 109
Nonaccrual Loans with Related Allowance |  | 159 |  | 159 |  | 69
Total Nonaccrual Loans |  | 250 |  | 250 |  | 178
Interest income |  | 2 | $ 2 | 8 | $ 8 |
Business loans: | Commercial |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 30 |  | 30 |  | 69
Nonaccrual Loans with Related Allowance |  | 159 |  | 159 |  | 69
Total Nonaccrual Loans |  | 189 |  | 189 |  | 138
Business loans: | Commercial | Domestic |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 22 |  | 22 |  | 47
Nonaccrual Loans with Related Allowance |  | 75 |  | 75 |  | 28
Total Nonaccrual Loans |  | 97 |  | 97 |  | 75
Business loans: | Commercial | International |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 0 |  | 0 |  | 3
Nonaccrual Loans with Related Allowance |  | 3 |  | 3 |  | 17
Total Nonaccrual Loans |  | 3 |  | 3 |  | 20
Retail loans: |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 61 |  | 61 |  | 40
Nonaccrual Loans with Related Allowance |  | 0 |  | 0 |  | 0
Total Nonaccrual Loans |  | 61 |  | 61 |  | 40
Retail loans: | Consumer |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Nonaccrual Loans with No Related Allowance |  |  |  |  |  | 21
Nonaccrual Loans with Related Allowance |  |  |  |  |  | 0
Total Nonaccrual Loans |  | 25 |  | 25 |  | 21
Real estate construction | Business loans: | Commercial | Domestic |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Total Nonaccrual Loans |  | 0 |  | 0 |  | 2
Real estate construction | Commercial | Business loans: | Commercial | Domestic |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Total Nonaccrual Loans | [1] | 0 |  | 0 |  | 0
Real estate construction | Other business lines | Business loans: | Commercial | Domestic |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Nonaccrual Loans with No Related Allowance | [2] |  |  |  |  | 2
Nonaccrual Loans with Related Allowance | [2] |  |  |  |  | 0
Total Nonaccrual Loans | [2] | 0 |  | 0 |  | 2
Commercial mortgage: | Business loans: | Commercial | Domestic |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 8 |  | 8 |  | 17
Nonaccrual Loans with Related Allowance |  | 80 |  | 80 |  | 24
Total Nonaccrual Loans |  | 88 |  | 88 |  | 41
Commercial mortgage: | Commercial | Business loans: | Commercial | Domestic |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Nonaccrual Loans with No Related Allowance | [1] | 0 |  | 0 |  | 0
Nonaccrual Loans with Related Allowance | [1] | 18 |  | 18 |  | 18
Total Nonaccrual Loans | [1] | 18 |  | 18 |  | 18
Commercial mortgage: | Other business lines | Business loans: | Commercial | Domestic |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Nonaccrual Loans with No Related Allowance | [2] | 8 |  | 8 |  | 17
Nonaccrual Loans with Related Allowance | [2] | 62 |  | 62 |  | 6
Total Nonaccrual Loans | [2] | 70 |  | 70 |  | 23
Residential mortgage | Retail loans: |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 36 |  | 36 |  | 19
Nonaccrual Loans with Related Allowance |  | 0 |  | 0 |  | 0
Total Nonaccrual Loans |  | 36 |  | 36 |  | 19
Home equity | Retail loans: | Consumer |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 25 |  | 25 |  | 21
Nonaccrual Loans with Related Allowance |  | 0 |  | 0 |  | 0
Total Nonaccrual Loans |  | 25 |  | 25 |  | 21
Other consumer | Retail loans: | Consumer |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Total Nonaccrual Loans |  | 0 |  | 0 |  | 0
Lease financing | Business loans: | Commercial | Domestic |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Total Nonaccrual Loans |  | 1 |  | 1 |  | $ 0
Lease financing | Lease financing | Business loans: | Commercial | Domestic |  |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 0 |  | 0 |  |
Nonaccrual Loans with Related Allowance |  | 1 |  | 1 |  |
Total Nonaccrual Loans |  | $ 1 |  | $ 1 |  |
[1] | Primarily loans to real estate developers.
[2] | Primarily loans secured by owner-occupied real estate.

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