Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases - Commercial Loans TDRs (Details)

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Outstanding Loans and Leases - Commercial Loans TDRs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Financing Receivable, Modifications [Line Items]          
Threshold period past due for nonperforming status of financing receivables     90 days   90 days
Commercial          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance $ 376 $ 457 $ 1,074 $ 1,176  
Carrying Value 353 403 997 1,109  
Net Charge-offs 12 41 $ 18 43  
Threshold period past due for nonperforming status of financing receivables     90 days    
Commercial | U.S. Commercial          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 347 361 $ 977 808  
Carrying Value 324 317 900 759  
Net Charge-offs 12 33 18 35  
Trouble debt restructurings entered payment default that were modified during the preceding twelve months     85 63  
Commercial | Non United States          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 10 45 45 45  
Carrying Value 10 45 45 45  
Net Charge-offs 0 0 0 0  
Commercial | Commercial Real Estate          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 17 49 47 317  
Carrying Value 17 39 47 299  
Net Charge-offs 0 8 0 8  
Trouble debt restructurings entered payment default that were modified during the preceding twelve months     26 67  
Commercial | Small Business Commercial          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 2 2 5 6  
Carrying Value 2 2 5 6  
Net Charge-offs $ 0 $ 0 $ 0 $ 0