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Credit Quality And Allowance For Credit Losses (Nonaccrual Loans) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |
Nonaccrual Loans with No Related Allowance | $ 105 |  | $ 105 |  | $ 140
Nonaccrual Loans with Related Allowance | 81 |  | 81 |  | 100
Total Nonaccrual Loans | 186 |  | 186 |  | 240
Interest income | 2 | $ 2 | 6 | $ 4 |
Business loans: | Commercial |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |
Nonaccrual Loans with No Related Allowance | 58 |  | 58 |  | 71
Nonaccrual Loans with Related Allowance | 78 |  | 78 |  | 100
Total Nonaccrual Loans | 136 |  | 136 |  | 171
Business loans: | Commercial | Domestic |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |
Nonaccrual Loans with No Related Allowance | 49 |  | 49 |  | 64
Nonaccrual Loans with Related Allowance | 44 |  | 44 |  | 78
Total Nonaccrual Loans | 93 |  | 93 |  | 142
Business loans: | Commercial | International |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |
Nonaccrual Loans with No Related Allowance | 0 |  | 0 |  | 3
Nonaccrual Loans with Related Allowance | 4 |  | 4 |  | 0
Total Nonaccrual Loans | 4 |  | 4 |  | 3
Retail loans: |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |
Nonaccrual Loans with No Related Allowance | 47 |  | 47 |  | 69
Nonaccrual Loans with Related Allowance | 3 |  | 3 |  | 0
Total Nonaccrual Loans | 50 |  | 50 |  | 69
Retail loans: | Consumer |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |
Nonaccrual Loans with No Related Allowance |  |  |  |  | 16
Nonaccrual Loans with Related Allowance |  |  |  |  | 0
Total Nonaccrual Loans | 17 |  | 17 |  | 16
Real estate construction: | Business loans: | Commercial | Domestic |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |
Total Nonaccrual Loans | 2 |  | 2 |  | 3
Real estate construction: | Commercial | Business loans: | Commercial | Domestic |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |
Total Nonaccrual Loans | 0 |  | 0 |  | 0
Real estate construction: | Other business lines | Business loans: | Commercial | Domestic |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |
Nonaccrual Loans with No Related Allowance | 0 |  | 0 |  | 0
Nonaccrual Loans with Related Allowance | 2 |  | 2 |  | 3
Total Nonaccrual Loans | 2 |  | 2 |  | 3
Commercial mortgage: | Business loans: | Commercial | Domestic |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |
Nonaccrual Loans with No Related Allowance | 9 |  | 9 |  | 4
Nonaccrual Loans with Related Allowance | 28 |  | 28 |  | 19
Total Nonaccrual Loans | 37 |  | 37 |  | 23
Commercial mortgage: | Commercial | Business loans: | Commercial | Domestic |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |
Nonaccrual Loans with No Related Allowance | 0 |  | 0 |  | 0
Nonaccrual Loans with Related Allowance | 1 |  | 1 |  | 1
Total Nonaccrual Loans | 1 |  | 1 |  | 1
Commercial mortgage: | Other business lines | Business loans: | Commercial | Domestic |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |
Nonaccrual Loans with No Related Allowance | 9 |  | 9 |  | 4
Nonaccrual Loans with Related Allowance | 27 |  | 27 |  | 18
Total Nonaccrual Loans | 36 |  | 36 |  | 22
Residential mortgage | Retail loans: |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |
Nonaccrual Loans with No Related Allowance | 30 |  | 30 |  | 53
Nonaccrual Loans with Related Allowance | 3 |  | 3 |  | 0
Total Nonaccrual Loans | 33 |  | 33 |  | 53
Home equity | Retail loans: | Consumer |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |
Nonaccrual Loans with No Related Allowance | 17 |  | 17 |  | 15
Nonaccrual Loans with Related Allowance | 0 |  | 0 |  | 0
Total Nonaccrual Loans | 17 |  | 17 |  | 15
Other consumer | Retail loans: | Consumer |  |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |  |
Nonaccrual Loans with No Related Allowance |  |  |  |  | 1
Nonaccrual Loans with Related Allowance |  |  |  |  | 0
Total Nonaccrual Loans | $ 0 |  | $ 0 |  | $ 1

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