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Credit Quality And Allowance For Credit Losses (Nonaccrual Loans) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | $ 109 |  | $ 140
Nonaccrual Loans with Related Allowance |  | 69 |  | 100
Total Nonaccrual Loans |  | 178 |  | 240
Business loans | Commercial |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 69 |  | 71
Nonaccrual Loans with Related Allowance |  | 69 |  | 100
Total Nonaccrual Loans |  | 138 |  | 171
Business loans | Commercial | Domestic loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 47 |  | 64
Nonaccrual Loans with Related Allowance |  | 28 |  | 78
Total Nonaccrual Loans |  | 75 |  | 142
Business loans | Commercial | International |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 3 |  | 3
Nonaccrual Loans with Related Allowance |  | 17 |  | 0
Total Nonaccrual Loans |  | 20 |  | 3
Retail loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 40 |  | 69
Nonaccrual Loans with Related Allowance |  | 0 |  | 0
Total Nonaccrual Loans |  | 40 |  | 69
Retail loans | Consumer |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 21 |  | 16
Nonaccrual Loans with Related Allowance |  | 0 |  | 0
Total Nonaccrual Loans |  | 21 |  | 16
Real estate construction | Business loans | Commercial | Domestic loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total Nonaccrual Loans |  | 2 |  | 3
Real estate construction | Commercial | Business loans | Commercial | Domestic loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Total Nonaccrual Loans |  | 0 | [1] | 0
Real estate construction | Other business lines | Business loans | Commercial | Domestic loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 2 |  | 0
Nonaccrual Loans with Related Allowance |  | 0 |  | 3
Total Nonaccrual Loans |  | 2 |  | 3
Commercial mortgage | Business loans | Commercial | Domestic loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 17 |  | 4
Nonaccrual Loans with Related Allowance |  | 24 |  | 19
Total Nonaccrual Loans |  | 41 |  | 23
Commercial mortgage | Commercial | Business loans | Commercial | Domestic loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 0 |  | 0
Nonaccrual Loans with Related Allowance |  | 18 |  | 1
Total Nonaccrual Loans | [2] | 18 |  | 1
Commercial mortgage | Other business lines | Business loans | Commercial | Domestic loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 17 |  | 4
Nonaccrual Loans with Related Allowance |  | 6 |  | 18
Total Nonaccrual Loans |  | 23 |  | 22
Residential mortgage | Retail loans |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 19 |  | 53
Nonaccrual Loans with Related Allowance |  | 0 |  | 0
Total Nonaccrual Loans |  | 19 |  | 53
Home equity | Retail loans | Consumer |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 21 |  | 15
Nonaccrual Loans with Related Allowance |  | 0 |  | 0
Total Nonaccrual Loans |  | $ 21 |  | 15
Other Consumer | Retail loans | Consumer |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  |  |  | 1
Nonaccrual Loans with Related Allowance |  |  |  | 0
Total Nonaccrual Loans |  |  |  | $ 1
[1] | Primarily loans to real estate developers.
[2] | Primarily loans secured by owner-occupied real estate.

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