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Credit Quality And Allowance For Credit Losses (Nonaccrual Loans) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | $ 138 |  | $ 140
Nonaccrual Loans with Related Allowance |  | 83 |  | 100
Total Nonaccrual Loans |  | 221 |  | 240
Interest income |  | 4 | $ 2 |
Business loans: | Commercial |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 84 |  | 71
Nonaccrual Loans with Related Allowance |  | 80 |  | 100
Total Nonaccrual Loans |  | 164 |  | 171
Business loans: | Commercial | Domestic |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 79 |  | 64
Nonaccrual Loans with Related Allowance |  | 55 |  | 78
Total Nonaccrual Loans |  | 134 |  | 142
Business loans: | Commercial | International |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 3 |  | 3
Nonaccrual Loans with Related Allowance |  | 0 |  | 0
Total Nonaccrual Loans |  | 3 |  | 3
Business loans: | Commercial | International |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Total Nonaccrual Loans |  | 3 |  | 3
Retail loans: |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 54 |  | 69
Nonaccrual Loans with Related Allowance |  | 3 |  | 0
Total Nonaccrual Loans |  | 57 |  | 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 |  | 18 |  | 16
Real estate construction: | Business loans: | Commercial | Domestic |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Total Nonaccrual Loans |  | 3 |  | 3
Real estate construction: | Commercial | Business loans: | Commercial | Domestic |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Total Nonaccrual Loans | [1] | 0 |  | 0
Real estate construction: | Other business lines | Business loans: | Commercial | Domestic |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance | [2] | 0 |  | 0
Nonaccrual Loans with Related Allowance | [2] | 3 |  | 3
Total Nonaccrual Loans | [2] | 3 |  | 3
Commercial mortgage: | Business loans: | Commercial | Domestic |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 2 |  | 4
Nonaccrual Loans with Related Allowance |  | 22 |  | 19
Total Nonaccrual Loans |  | 24 |  | 23
Commercial mortgage: | Commercial | Business loans: | Commercial | Domestic |  |  |  |
Financing Receivable, Nonaccrual [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 | Domestic |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance | [2] | 2 |  | 4
Nonaccrual Loans with Related Allowance | [2] | 21 |  | 18
Total Nonaccrual Loans | [2] | 23 |  | 22
Residential mortgage | Retail loans: |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 36 |  | 53
Nonaccrual Loans with Related Allowance |  | 3 |  | 0
Total Nonaccrual Loans |  | 39 |  | 53
Home equity | Retail loans: | Consumer |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Nonaccrual Loans with No Related Allowance |  | 18 |  | 15
Nonaccrual Loans with Related Allowance |  | 0 |  | 0
Total Nonaccrual Loans |  | 18 |  | 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 |  | 1
Lease financing | Business loans: | Commercial | Domestic |  |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |  |
Total Nonaccrual Loans |  | $ 0 |  | $ 0
[1] | Primarily loans to real estate developers.
[2] | Primarily loans secured by owner-occupied real estate.

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