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Credit Quality And Allowance For Credit Losses (Individually Evaluated Impaired Loans) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance $ 86 $ 121
Recorded investment in impaired loans with related allowance 129 155
Recorded investment total impaired loans 215 276
Unpaid principal balance 333 346
Related allowance for loan losses 31 27
Business loans | Commercial borrower    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 70 93
Recorded investment in impaired loans with related allowance 129 147
Recorded investment total impaired loans 199 240
Unpaid principal balance 315 307
Related allowance for loan losses 31 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 120 130
Recorded investment total impaired loans 150 180
Unpaid principal balance 251 227
Related allowance for loan losses 30 24
Business loans | Commercial borrower | International loans    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance   2
Recorded investment in impaired loans with related allowance   1
Recorded investment total impaired loans   3
Unpaid principal balance   8
Related allowance for loan losses   0
Business loans | Real estate mortgage | Commercial borrower | Domestic loans    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 40 41
Recorded investment in impaired loans with related allowance 9 16
Recorded investment total impaired loans 49 57
Unpaid principal balance 64 72
Related allowance for loan losses 1 3
Business loans | Real estate 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 | Real estate mortgage | Commercial borrower | Domestic loans | Other business lines    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance [2] 1 2
Recorded investment in impaired loans with related allowance [2] 9 16
Recorded investment total impaired loans [2] 10 18
Unpaid principal balance [2] 15 23
Related allowance for loan losses [2] 1 3
Retail loans    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance [3] 16 28
Recorded investment in impaired loans with related allowance [3] 0 8
Recorded investment total impaired loans [3] 16 36
Unpaid principal balance [3] 18 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   12
Recorded investment in impaired loans with related allowance   0
Recorded investment total impaired loans   12
Unpaid principal balance   14
Related allowance for loan losses   0
Retail loans | Home equity | Consumer borrower    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 8 11
Recorded investment in impaired loans with related allowance 0 0
Recorded investment total impaired loans 8 11
Unpaid principal balance 10 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
Recorded investment in impaired loans with related allowance   0
Recorded investment total impaired loans   1
Unpaid principal balance   1
Related allowance for loan losses   0
Retail loans | Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 8 16
Recorded investment in impaired loans with related allowance 0 8
Recorded investment total impaired loans 8 24
Unpaid principal balance 8 25
Related allowance for loan losses $ 0 $ 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.