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 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
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 $ 788 $ 954  
Carrying Value $ 767 885  
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 $ 198    
Carrying Value 198    
Troubled debt restructurings entering payment default that were modified during the preceding twelve months 3 18  
Commercial Portfolio Segment | Commercial lease financing      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance 3 2  
Carrying Value 3 1  
Troubled debt restructurings entering payment default that were modified during the preceding twelve months 3 4  
Commercial Portfolio Segment | Small Business Commercial      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance 4 3  
Carrying Value 4 3  
Commercial Portfolio Segment | United States      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance 480 618  
Carrying Value 459 550  
Troubled debt restructurings entering payment default that were modified during the preceding twelve months 116 139  
Commercial Portfolio Segment | Non United States      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance 103 331  
Carrying Value $ 103 $ 331