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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.