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Credit Quality And Allowance For Credit Losses (Individually Evaluated Impaired Loans) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance $ 174 $ 122
Recorded investment in impaired loans with related allowance 532 302
Recorded investment total impaired loans 706 424
Unpaid principal balance 823 547
Related allowance for loan losses 116 53
Business loans | Commercial borrower    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 148 91
Recorded investment in impaired loans with related allowance 529 302
Recorded investment total impaired loans 677 393
Unpaid principal balance 788 508
Related allowance for loan losses 115 53
Business loans | Commercial borrower | Domestic loans    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 141 82
Recorded investment in impaired loans with related allowance 482 252
Recorded investment total impaired loans 623 334
Unpaid principal balance 704 398
Related allowance for loan losses 106 45
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 16 10
Recorded investment total impaired loans 19 10
Unpaid principal balance 26 17
Related allowance for loan losses 5 2
Business loans | Real estate mortgage | Commercial borrower | Domestic loans    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 4 9
Recorded investment in impaired loans with related allowance 31 40
Recorded investment total impaired loans 35 49
Unpaid principal balance 58 93
Related allowance for loan losses 4 6
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] 0 7
Recorded investment in impaired loans with related allowance [1] 6 8
Recorded investment total impaired loans [1] 6 15
Unpaid principal balance [1] 15 38
Related allowance for loan losses [1] 1 1
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] 4 2
Recorded investment in impaired loans with related allowance [2] 25 32
Recorded investment total impaired loans [2] 29 34
Unpaid principal balance [2] 43 55
Related allowance for loan losses [2] 3 5
Retail loans    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance [3] 26 31
Recorded investment in impaired loans with related allowance [3] 3 0
Recorded investment total impaired loans [3] 29 31
Unpaid principal balance [3] 35 39
Related allowance for loan losses [3] 1 0
Retail loans | Consumer borrower    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 14 18
Recorded investment in impaired loans with related allowance 3 0
Recorded investment total impaired loans 17 18
Unpaid principal balance 22 26
Related allowance for loan losses 1 0
Retail loans | Real estate mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded investment in impaired loans with no related allowance 12 13
Recorded investment in impaired loans with related allowance 0 0
Recorded investment total impaired loans 12 13
Unpaid principal balance 13 13
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 12
Recorded investment in impaired loans with related allowance 0 0
Recorded investment total impaired loans 12 12
Unpaid principal balance 16 16
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 2 6
Recorded investment in impaired loans with related allowance 3 0
Recorded investment total impaired loans 5 6
Unpaid principal balance 6 10
Related allowance for loan losses $ 1 $ 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.