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Credit Quality And Allowance For Credit Losses (Individually Evaluated Impaired Loans) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance $ 99 $ 121
Recorded investment in impaired loans with related allowance 137 155
Recorded investment total impaired loans 236 276
Unpaid principal balance 310 346
Related allowance for loan losses 35 27
Business loans | Commercial borrower    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 73 93
Recorded investment in impaired loans with related allowance 129 147
Recorded investment total impaired loans 202 240
Unpaid principal balance 273 307
Related allowance for loan losses 35 27
Business loans | Commercial borrower | Domestic loans    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 30 50
Recorded investment in impaired loans with related allowance 114 130
Recorded investment total impaired loans 144 180
Unpaid principal balance 194 227
Related allowance for loan losses 33 24
Business loans | Commercial borrower | International loans    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 2 2
Recorded investment in impaired loans with related allowance 1 1
Recorded investment total impaired loans 3 3
Unpaid principal balance 9 8
Related allowance for loan losses 0 0
Business loans | Commercial mortgage | Commercial borrower | Domestic loans    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 41 41
Recorded investment in impaired loans with related allowance 13 16
Recorded investment total impaired loans 54 57
Unpaid principal balance 69 72
Related allowance for loan losses 2 3
Business loans | Commercial mortgage | Commercial borrower | Domestic loans | Commercial Real Estate business line    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance [1] 39 39
Recorded investment in impaired loans with related allowance [1] 0 0
Recorded investment total impaired loans [1] 39 39
Unpaid principal balance [1] 49 49
Related allowance for loan losses [1] 0 0
Business loans | Commercial mortgage | Commercial borrower | Domestic loans | Other business lines    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance [2] 2 2
Recorded investment in impaired loans with related allowance [2] 13 16
Recorded investment total impaired loans [2] 15 18
Unpaid principal balance [2] 20 23
Related allowance for loan losses [2] 2 3
Retail loans    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance [3] 26 28
Recorded investment in impaired loans with related allowance [3] 8 8
Recorded investment total impaired loans [3] 34 36
Unpaid principal balance [3] 37 39
Related allowance for loan losses [3] 0 0
Retail loans | Consumer borrower    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 10 12
Recorded investment in impaired loans with related allowance 0 0
Recorded investment total impaired loans 10 12
Unpaid principal balance 12 14
Related allowance for loan losses 0 0
Retail loans | Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 16 16
Recorded investment in impaired loans with related allowance 8 8
Recorded investment total impaired loans 24 24
Unpaid principal balance 25 25
Related allowance for loan losses 0 0
Retail loans | Home equity | Consumer borrower    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 9 11
Recorded investment in impaired loans with related allowance 0 0
Recorded investment total impaired loans 9 11
Unpaid principal balance 11 13
Related allowance for loan losses 0 0
Retail loans | Other consumer | Consumer borrower    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 1 1
Recorded investment in impaired loans with related allowance 0 0
Recorded investment total impaired loans 1 1
Unpaid principal balance 1 1
Related allowance for loan losses 0 $ 0
Business Loans Member | Lease financing | Commercial borrower | Domestic loans    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 0  
Recorded investment in impaired loans with related allowance 1  
Recorded investment total impaired loans 1  
Unpaid principal balance 1  
Related allowance for loan losses $ 0  
[1] Primarily loans to real estate developers.
[2] Primarily loans secured by owner-occupied real estate.
[3] Individually evaluated retail loans generally have no related allowance for loan losses, primarily due to policy which results in direct write-downs of most restructured retail loans.