Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases - Commercial - TDRs Entered Into During the Period (Details)

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Outstanding Loans and Leases - Commercial - TDRs Entered Into During the Period (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 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 $ 477 $ 817 $ 907 $ 1,770  
Carrying Value 442 792 838 1,667  
Net charge-offs 27 14 $ 89 94  
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 0 4 $ 16 11  
Carrying Value 0 4 9 11  
Trouble debt restructurings entered payment default that were modified during the preceding twelve months     32 17  
Commercial Portfolio Segment | Commercial lease financing          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 12 2 12 7  
Carrying Value 12 2 12 4  
Commercial Portfolio Segment | Small Business Commercial          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 3 1 11 4  
Carrying Value 3 1 12 4  
Trouble debt restructurings entered payment default that were modified during the preceding twelve months     0 2  
Commercial Portfolio Segment | United States          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 357 793 763 1,483  
Carrying Value 322 768 700 1,447  
Trouble debt restructurings entered payment default that were modified during the preceding twelve months     57 123  
Commercial Portfolio Segment | Non United States          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 105 17 105 265  
Carrying Value $ 105 $ 17 $ 105 $ 201