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Credit Quality And Allowance For Credit Losses (Individually Evaluated Impaired Loans) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance $ 138 $ 173
Recorded investment in impaired loans with related allowance 165 304
Recorded investment total impaired loans 303 477
Unpaid principal balance 387 593
Related allowance for loan losses 29 67
Business loans | Commercial borrower    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 112 147
Recorded investment in impaired loans with related allowance 157 296
Recorded investment total impaired loans 269 443
Unpaid principal balance 349 555
Related allowance for loan losses 29 67
Business loans | Commercial borrower | Domestic loans    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 66 105
Recorded investment in impaired loans with related allowance 137 267
Recorded investment total impaired loans 203 372
Unpaid principal balance 263 460
Related allowance for loan losses 27 63
Business loans | Commercial borrower | International loans    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 3 0
Recorded investment in impaired loans with related allowance 2 6
Recorded investment total impaired loans 5 6
Unpaid principal balance 10 17
Related allowance for loan losses 0 1
Business loans | Real estate mortgage | Commercial borrower | Domestic loans    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 43 42
Recorded investment in impaired loans with related allowance 18 23
Recorded investment total impaired loans 61 65
Unpaid principal balance 76 78
Related allowance for loan losses 2 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] 38 39
Recorded investment in impaired loans with related allowance [1] 1 1
Recorded investment total impaired loans [1] 39 40
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] 5 3
Recorded investment in impaired loans with related allowance [2] 17 22
Recorded investment total impaired loans [2] 22 25
Unpaid principal balance [2] 27 29
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 26
Recorded investment in impaired loans with related allowance [3] 8 8
Recorded investment total impaired loans [3] 34 34
Unpaid principal balance [3] 38 38
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 13 12
Recorded investment in impaired loans with related allowance 0 0
Recorded investment total impaired loans 13 12
Unpaid principal balance 16 16
Related allowance for loan losses 0 0
Retail loans | Real estate mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 13 14
Recorded investment in impaired loans with related allowance 8 8
Recorded investment total impaired loans 21 22
Unpaid principal balance 22 22
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 12 11
Recorded investment in impaired loans with related allowance 0 0
Recorded investment total impaired loans 12 11
Unpaid principal balance 14 14
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 2 2
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.