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Credit Quality And Allowance For Credit Losses (Nonaccrual Loans) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual Loans with No Related Allowance |  | $ 140 | $ 60
Nonaccrual Loans with Related Allowance |  | 100 | 204
Total Nonaccrual Loans |  | 240 | 264
Business loans | Commercial borrower |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual Loans with No Related Allowance |  | 71 | 12
Nonaccrual Loans with Related Allowance |  | 100 | 204
Total Nonaccrual Loans |  | 171 | 216
Business loans | Commercial borrower | Domestic loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual Loans with No Related Allowance |  | 64 | 8
Nonaccrual Loans with Related Allowance |  | 78 | 165
Total Nonaccrual Loans |  | 142 | 173
Business loans | Commercial borrower | Non-US |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual Loans with No Related Allowance |  | 3 | 0
Nonaccrual Loans with Related Allowance |  | 0 | 5
Total Nonaccrual Loans |  | 3 | 5
Retail loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual Loans with No Related Allowance |  | 69 | 48
Nonaccrual Loans with Related Allowance |  | 0 | 0
Total Nonaccrual Loans |  | 69 | 48
Retail loans | Consumer borrower |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual Loans with No Related Allowance |  | 16 |
Nonaccrual Loans with Related Allowance |  | 0 |
Total Nonaccrual Loans |  | 16 | 12
Real estate construction | Business loans | Commercial borrower | Domestic loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Nonaccrual Loans |  | 3 | 6
Real estate construction | Commercial Real Estate business line | Business loans | Commercial borrower | Domestic loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Total Nonaccrual Loans | [1] | 0 | 0
Real estate construction | Other business lines | Business loans | Commercial borrower | Domestic loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual Loans with No Related Allowance | [2] | 0 | 0
Nonaccrual Loans with Related Allowance | [2] | 3 | 6
Total Nonaccrual Loans | [2] | 3 | 6
Commercial mortgage | Business loans | Commercial borrower | Domestic loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual Loans with No Related Allowance |  | 4 | 4
Nonaccrual Loans with Related Allowance |  | 19 | 28
Total Nonaccrual Loans |  | 23 | 32
Commercial mortgage | Commercial Real Estate business line | Business loans | Commercial borrower | Domestic loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual Loans with No Related Allowance | [1] | 0 | 0
Nonaccrual Loans with Related Allowance | [1] | 1 | 1
Total Nonaccrual Loans | [1] | 1 | 1
Commercial mortgage | Other business lines | Business loans | Commercial borrower | Domestic loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual Loans with No Related Allowance | [2] | 4 | 4
Nonaccrual Loans with Related Allowance | [2] | 18 | 27
Total Nonaccrual Loans | [2] | 22 | 31
Residential mortgage | Retail loans |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual Loans with No Related Allowance |  | 53 | 36
Nonaccrual Loans with Related Allowance |  | 0 | 0
Total Nonaccrual Loans |  | 53 | 36
Home equity | Retail loans | Consumer borrower |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual Loans with No Related Allowance |  | 15 | 12
Nonaccrual Loans with Related Allowance |  | 0 | 0
Total Nonaccrual Loans |  | 15 | 12
Other consumer | Retail loans | Consumer borrower |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Nonaccrual Loans with No Related Allowance |  | 1 |
Nonaccrual Loans with Related Allowance |  | 0 |
Total Nonaccrual Loans |  | $ 1 | $ 0
[1] | Primarily loans to real estate developers.
[2] | Primarily loans secured by owner-occupied real estate.

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