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Credit Quality And Allowance For Credit Losses (Nonaccrual Loans) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance $ 72 $ 69
Financing Receivable, Nonaccrual 163 130
Nonaccrual loans 235 199
Business loans | Commercial borrower    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance 30 32
Financing Receivable, Nonaccrual 163 130
Nonaccrual loans 193 162
Business loans | Commercial borrower | Domestic loans    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance 25 29
Financing Receivable, Nonaccrual 148 119
Nonaccrual loans 173 148
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 42 37
Financing Receivable, Nonaccrual 0 0
Nonaccrual loans 42 37
Retail loans | Consumer borrower    
Financing Receivable, Nonaccrual [Line Items]    
Nonaccrual loans 22 17
Commercial mortgage | Business loans | Commercial borrower | Domestic loans    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance 5 3
Financing Receivable, Nonaccrual 14 11
Nonaccrual loans 19 14 [1]
Commercial mortgage | Commercial Real Estate business line | Business loans | Commercial borrower | Domestic loans    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance [2] 2 2
Financing Receivable, Nonaccrual [2] 1 0
Nonaccrual loans [2] 3 2
Commercial mortgage | Other business lines | Business loans | Commercial borrower | Domestic loans    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance [1] 3 1
Financing Receivable, Nonaccrual [1] 13 11
Nonaccrual loans [1] 16 12
Residential mortgage | Retail loans    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance 20 20
Financing Receivable, Nonaccrual 0 0
Nonaccrual loans 20 20
Home equity | Retail loans | Consumer borrower    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual, No Allowance 22 17
Financing Receivable, Nonaccrual 0 0
Nonaccrual loans 22 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 secured by owner-occupied real estate.
[2]
Primarily loans to real estate developers.