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Credit Quality And Allowance For Credit Losses (Nonaccrual Loans) (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Nonaccrual [Line Items] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | $ 154 | $ 60
Financing Receivable, Nonaccrual |  | 105 | 204
Nonaccrual loans |  | 259 | 264
Business loans | Commercial borrower |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 83 | 12
Financing Receivable, Nonaccrual |  | 105 | 204
Nonaccrual loans |  | 188 | 216
Business loans | Commercial borrower | Domestic loans |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 74 | 8
Financing Receivable, Nonaccrual |  | 80 | 165
Nonaccrual loans |  | 154 | 173
Business loans | Commercial borrower | Non-US |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 5 | 0
Financing Receivable, Nonaccrual |  | 0 | 5
Nonaccrual loans |  | 5 | 5
Retail loans |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 71 | 48
Financing Receivable, Nonaccrual |  | 0 | 0
Nonaccrual loans |  | 71 | 48
Retail loans | Home equity |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 15 |
Financing Receivable, Nonaccrual |  | 0 |
Nonaccrual loans |  | 15 | 12
Real estate construction | Business loans | Commercial borrower | Domestic loans |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Nonaccrual loans |  | 4 | 6
Real estate construction | Commercial Real Estate business line | Business loans | Commercial borrower | Domestic loans |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Nonaccrual loans | [1] | 0 | 0
Real estate construction | Other business lines | Business loans | Commercial borrower | Domestic loans |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Financing Receivable, Nonaccrual, No Allowance | [2] | 0 | 0
Financing Receivable, Nonaccrual | [2] | 4 | 6
Nonaccrual loans | [2] | 4 | 6
Commercial mortgage | Business loans | Commercial borrower | Domestic loans |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 4 | 4
Financing Receivable, Nonaccrual |  | 21 | 28
Nonaccrual loans |  | 25 | 32
Commercial mortgage | Commercial Real Estate business line | Business loans | Commercial borrower | Domestic loans |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Financing Receivable, Nonaccrual, No Allowance | [1] | 0 | 0
Financing Receivable, Nonaccrual | [1] | 1 | 1
Nonaccrual loans | [1] | 1 | 1
Commercial mortgage | Other business lines | Business loans | Commercial borrower | Domestic loans |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Financing Receivable, Nonaccrual, No Allowance | [2] | 4 | 4
Financing Receivable, Nonaccrual | [2] | 20 | 27
Nonaccrual loans | [2] | 24 | 31
Residential mortgage | Retail loans |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 56 | 36
Financing Receivable, Nonaccrual |  | 0 | 0
Nonaccrual loans |  | 56 | 36
Home equity | Retail loans | Home equity |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 14 | 12
Financing Receivable, Nonaccrual |  | 0 | 0
Nonaccrual loans |  | 14 | 12
Other consumer | Retail loans | Home equity |  |  |
Financing Receivable, Nonaccrual [Line Items] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 1 |
Financing Receivable, Nonaccrual |  | 0 |
Nonaccrual loans |  | $ 1 | $ 0
[1] | Primarily loans to real estate developers.
[2] | Primarily loans secured by owner-occupied real estate.

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