Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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 $ 1,206 $ 1,895 $ 1,238
Carrying Value 1,081 1,817 1,158
Net charge-offs $ 138 137 31
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 $ 35 77 42
Carrying Value 24 77 42
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 19 34 25
Commercial Portfolio Segment | Commercial lease financing      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance 20 6  
Carrying Value 17 4  
Commercial Portfolio Segment | Small Business Commercial      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance 13 1 14
Carrying Value 13 1 11
Commercial Portfolio Segment | United States      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance 1,033 1,556 853
Carrying Value 922 1,482 779
Trouble debt restructurings entered payment default that were modified during the preceding twelve months 64 140 105
Commercial Portfolio Segment | Non United States      
Financing Receivable, Modifications [Line Items]      
Unpaid Principal Balance 105 255 329
Carrying Value $ 105 $ 253 $ 326