Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Outstanding Loans and Leases - Credit Card and Other Consumer - TDRs Entered into During the Period, Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
payment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Financing Receivable, Modifications [Line Items]      
Number of consecutive missed payments | payment 2    
Credit card and other consumer      
Financing Receivable, Modifications [Line Items]      
Period for payment default after modification 12 months    
Credit card and other consumer | Credit Card Receivable | United States      
Financing Receivable, Modifications [Line Items]      
Percent expected to be in payment default within 12 months after modification 13.00%    
Trouble debt restructurings entered payment default that were modified during the preceding twelve months $ 28 $ 30 $ 43
Credit card and other consumer | Credit Card Receivable | Non United States      
Financing Receivable, Modifications [Line Items]      
Trouble debt restructurings entered payment default that were modified during the preceding twelve months $ 0 127 152
Credit card and other consumer | Direct/Indirect Consumer      
Financing Receivable, Modifications [Line Items]      
Percent expected to be in payment default within 12 months after modification 15.00%    
Trouble debt restructurings entered payment default that were modified during the preceding twelve months $ 4 $ 2 $ 3