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Credit Quality And Allowance For Credit Losses (Nonaccrual Loans) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance $ 107 $ 69
Financing Receivable, Nonaccrual 215 130
Nonaccrual loans 322 199
Business loans | Commercial borrower    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance 47 32
Financing Receivable, Nonaccrual 215 130
Nonaccrual loans 262 162
Business loans | Commercial borrower | Domestic loans    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance 39 29
Financing Receivable, Nonaccrual 202 119
Nonaccrual loans 241 148
Business loans | Commercial borrower | International loans    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual loans 0 0
Retail loans    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance 60 37
Financing Receivable, Nonaccrual 0 0
Nonaccrual loans 60 37
Retail loans | Consumer borrower    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual loans 20 17
Commercial mortgage | Business loans | Commercial borrower | Domestic loans    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance 8 3
Financing Receivable, Nonaccrual 12 11
Nonaccrual loans 20 14
Commercial mortgage | Commercial Real Estate business line | Business loans | Commercial borrower | Domestic loans    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance [1] 2 2
Financing Receivable, Nonaccrual [1] 1 0
Nonaccrual loans [1] 3 2
Commercial mortgage | Other business lines | Business loans | Commercial borrower | Domestic loans    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance [2] 6 1
Financing Receivable, Nonaccrual [2] 11 11
Nonaccrual loans [2] 17 12
Residential mortgage | Retail loans    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance 40 20
Financing Receivable, Nonaccrual 0 0
Nonaccrual loans 40 20
Home equity | Retail loans | Consumer borrower    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance 20 17
Financing Receivable, Nonaccrual 0 0
Nonaccrual loans 20 17
Other consumer | Retail loans | Consumer borrower    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual loans 0 $ 0
Business Loans | Finance Leases Portfolio Segment [Member] | Commercial borrower | Domestic loans    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance 0  
Financing Receivable, Nonaccrual 1  
Nonaccrual loans $ 1  
[1] Primarily loans to real estate developers.
[2] Primarily loans secured by owner-occupied real estate.