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, 2017
Mar. 31, 2016
Dec. 31, 2016
Financing Receivable, Modifications [Line Items]      
Threshold period past due for nonperforming status of financing receivables 90 days   90 days
Commercial Portfolio Segment      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance $ 485 $ 857  
Carrying Value 451 804  
Net Charge-offs $ 41 42  
Threshold period past due for nonperforming status of financing receivables 90 days    
Commercial Portfolio Segment | Commercial Real Estate      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance $ 15 13  
Carrying Value 9 12  
Net Charge-offs 0 1  
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 33 17  
Commercial Portfolio Segment | Commercial lease financing      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance 0    
Carrying Value 0    
Net Charge-offs 0    
Commercial Portfolio Segment | Small Business Commercial      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance 2 3  
Carrying Value 2 4  
Net Charge-offs 0 0  
Commercial Portfolio Segment | United States      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance 468 642  
Carrying Value 440 625  
Net Charge-offs 41 5  
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 111 111  
Commercial Portfolio Segment | Non United States      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance   199  
Carrying Value   163  
Net Charge-offs $ 0 $ 36