Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases - Credit Card and Other Consumer - TDRs Entered into During the Period, Narrative (Details)

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Outstanding Loans and Leases - Credit Card and Other Consumer - TDRs Entered into During the Period, Narrative (Details) - Credit card and other consumer
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
payment
Sep. 30, 2017
USD ($)
Financing Receivable, Modifications [Line Items]        
Number of consecutive missed payments | payment     2  
Period for payment default after modification     12 months  
Credit Card Receivable | United States        
Financing Receivable, Modifications [Line Items]        
Percent expected to be in payment default within 12 months after modification     13.00%  
Troubled debt restructurings entering payment default that were modified during the preceding twelve months $ 10 $ 7 $ 26 $ 19
Direct/Indirect Consumer        
Financing Receivable, Modifications [Line Items]        
Percent expected to be in payment default within 12 months after modification     16.00%  
Troubled debt restructurings entering payment default that were modified during the preceding twelve months $ 1 $ 1 $ 6 $ 3