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 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 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 $ 456 $ 1,007 $ 755 $ 1,658  
Carrying Value 437 964 704 1,533  
Net Charge-offs 21 38 $ 62 80  
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 44 12 $ 59 22  
Carrying Value 37 12 46 22  
Net Charge-offs 7 0 7 1  
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   5   5  
Carrying Value   2   2  
Net Charge-offs   2   2  
Commercial Portfolio Segment | Small Business Commercial          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 7 2 9 3  
Carrying Value 7 2 10 3  
Net Charge-offs 0 0 0 0  
Commercial Portfolio Segment | United States          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 405 873 687 1,341  
Carrying Value 393 849 648 1,299  
Net Charge-offs $ 14 24 55 29  
Trouble debt restructurings entered payment default that were modified during the preceding twelve months     $ 78 90  
Commercial Portfolio Segment | Non United States          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance   115   287  
Carrying Value   99   207  
Net Charge-offs   $ 12   $ 48