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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
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 $ 638 $ 477 $ 1,286 $ 907  
Carrying Value 584 442 1,178 838  
Net charge-offs 38 27 $ 64 89  
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 0 $ 71 16  
Carrying Value 0 0 71 9  
Troubled debt restructurings entering payment default that were modified during the preceding twelve months     4 32  
Commercial Portfolio Segment | Commercial lease financing          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 29 12 92 12  
Carrying Value 29 12 91 12  
Commercial Portfolio Segment | Small Business Commercial          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 3 3 8 11  
Carrying Value 2 3 6 12  
Commercial Portfolio Segment | United States          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 595 357 1,111 763  
Carrying Value 544 322 1,006 700  
Troubled debt restructurings entering payment default that were modified during the preceding twelve months     174 57  
Commercial Portfolio Segment | Non United States          
Financing Receivable, Modifications [Line Items]          
Unpaid Principal Balance 11 105 4 105  
Carrying Value $ 9 $ 105 $ 4 $ 105