Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases - Impaired Loans Commercial Loans (Details)

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Outstanding Loans and Leases - Impaired Loans Commercial Loans (Details) (Commercial Portfolio Segment [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Financing Receivable, Impaired [Line Items]          
Real Estate Acquired Through Foreclosure $ 425   $ 425   $ 612
Commercial Real Estate Receivable [Member]
          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 3,499   3,499   5,916
Carrying Value 2,660   2,660   4,479
Related Allowance 127   127   135
Average Carrying Value 2,870 5,054 3,526 5,418  
Interest Income Recognized 7 [1] 11 [1] 25 [1] 17 [1]  
Small Business Commercial Receivable [Member]
          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 399 [2]   399 [2]   531 [2]
Carrying Value 379 [2]   379 [2]   503 [2]
Related Allowance 109 [2]   109 [2]   172 [2]
Average Carrying Value 392 [2] 616 [2] 433 [2] 713 [2]  
Interest Income Recognized 3 [1],[2] 5 [1],[2] 10 [1],[2] 18 [1],[2]  
U.S. Commercial | Commercial Financing Receivable [Member]
          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 3,343   3,343   4,136
Carrying Value 2,499   2,499   2,972
Related Allowance 135   135   232
Average Carrying Value 2,570 3,046 2,805 3,181  
Interest Income Recognized 16 [1] 4 [1] 51 [1] 8 [1]  
Non-U.S. Commercial | Commercial Financing Receivable [Member]
          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 548   548   524
Carrying Value 176   176   159
Related Allowance 20   20   6
Average Carrying Value 190 168 186 180  
Interest Income Recognized 2 [1] 3 [1] 3 [1] 3 [1]  
Impaired Financing Receivable with No Related Allowance [Domain] | Commercial Real Estate Receivable [Member]
          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 1,194   1,194   2,587
Carrying Value 1,106   1,106   2,095
Average Carrying Value 1,318 2,041 1,661 1,913  
Interest Income Recognized 4 [1] 1 [1] 12 [1] 3 [1]  
Impaired Financing Receivable with No Related Allowance [Domain] | U.S. Commercial | Commercial Financing Receivable [Member]
          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 1,446   1,446   1,482
Carrying Value 1,138   1,138   985
Average Carrying Value 1,113 870 1,078 638  
Interest Income Recognized 9 [1] 0 [1] 26 [1] 1 [1]  
Impaired Financing Receivable with No Related Allowance [Domain] | Non-U.S. Commercial | Commercial Financing Receivable [Member]
          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 132   132   216
Carrying Value 131   131   101
Average Carrying Value 140 96 130 83  
Interest Income Recognized 1 [1]   1 [1]    
Impaired Financing Receivable with Related Allowance [Domain] | Commercial Real Estate Receivable [Member]
          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 2,305   2,305   3,329
Carrying Value 1,554   1,554   2,384
Related Allowance 127   127   135
Average Carrying Value 1,552 3,013 1,865 3,505  
Interest Income Recognized 3 [1] 10 [1] 13 [1] 14 [1]  
Impaired Financing Receivable with Related Allowance [Domain] | Small Business Commercial Receivable [Member]
          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 399 [2]   399 [2]   531 [2]
Carrying Value 379 [2]   379 [2]   503 [2]
Related Allowance 109 [2]   109 [2]   172 [2]
Average Carrying Value 392 [2] 616 [2] 433 [2] 713 [2]  
Interest Income Recognized 3 [1],[2] 5 [1],[2] 10 [1],[2] 18 [1],[2]  
Impaired Financing Receivable with Related Allowance [Domain] | U.S. Commercial | Commercial Financing Receivable [Member]
          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 1,897   1,897   2,654
Carrying Value 1,361   1,361   1,987
Related Allowance 135   135   232
Average Carrying Value 1,457 2,176 1,727 2,543  
Interest Income Recognized 7 [1] 4 [1] 25 [1] 7 [1]  
Impaired Financing Receivable with Related Allowance [Domain] | Non-U.S. Commercial | Commercial Financing Receivable [Member]
          
Financing Receivable, Impaired [Line Items]          
Unpaid Principal Balance 416   416   308
Carrying Value 45   45   58
Related Allowance 20   20   6
Average Carrying Value 50 72 56 97  
Interest Income Recognized $ 1 [1] $ 3 [1] $ 2 [1] $ 3 [1]  
[1] Interest income recognized includes interest accrued and collected on the outstanding balances of accruing impaired loans as well as interest cash collections on nonaccruing impaired loans for which the principal is considered collectible.
[2] Includes U.S. small business commercial renegotiated TDR loans and related allowance.