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 ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
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 $ 817,000,000 $ 376,000,000 $ 1,770,000,000 $ 1,074,000,000  
Carrying Value 792,000,000 353,000,000 1,667,000,000 997,000,000  
Net Charge-offs 14,000,000 12,000,000 $ 94,000,000 18,000,000  
Threshold period past due for nonperforming status of financing receivables     90 days    
Commercial | Commercial Real Estate          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 4,000,000 17,000,000 $ 11,000,000 47,000,000  
Carrying Value 4,000,000 17,000,000 11,000,000 47,000,000  
Net Charge-offs 0 0 1,000,000 0  
Trouble debt restructurings entered payment default that were modified during the preceding twelve months     17,000,000 26,000,000  
Commercial | Commercial Lease Financing          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 2,000,000   7,000,000    
Carrying Value 2,000,000   4,000,000    
Net Charge-offs 0   2,000,000    
Commercial | Small Business Commercial          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 1,000,000 2,000,000 4,000,000 5,000,000  
Carrying Value 1,000,000 2,000,000 4,000,000 5,000,000  
Net Charge-offs 0 0 0 0  
Trouble debt restructurings entered payment default that were modified during the preceding twelve months     2,000,000 0  
United States | Commercial          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 793,000,000 347,000,000 1,483,000,000 977,000,000  
Carrying Value 768,000,000 324,000,000 1,447,000,000 900,000,000  
Net Charge-offs 14,000,000 12,000,000 43,000,000 18,000,000  
Trouble debt restructurings entered payment default that were modified during the preceding twelve months     123,000,000 85,000,000  
Non United States | Commercial          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 17,000,000 10,000,000 265,000,000 45,000,000  
Carrying Value 17,000,000 10,000,000 201,000,000 45,000,000  
Net Charge-offs $ 0 $ 0 $ 48,000,000 $ 0