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 12 Months Ended
Mar. 31, 2016
Mar. 31, 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 $ 857 $ 390  
Carrying Value 804 370  
Net Charge-offs $ 42 3  
Threshold period past due for nonperforming status of financing receivables 90 days    
Commercial | Commercial Real Estate      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance $ 13 34  
Carrying Value 12 33  
Net Charge-offs 1 0  
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 17 60  
Commercial | Small Business Commercial      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance 3 2  
Carrying Value 4 2  
Net Charge-offs 0 0  
United States | Commercial      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance 642 346  
Carrying Value 625 327  
Net Charge-offs 5 3  
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 111 110  
Non United States | Commercial      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance 199 8  
Carrying Value 163 8  
Net Charge-offs $ 36 $ 0