Quarterly report pursuant to Section 13 or 15(d)

Outstanding Loans and Leases - Credit Card and Other Consumer - Credit Quality Indicators (Details)

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Outstanding Loans and Leases - Credit Card and Other Consumer - Credit Quality Indicators (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 935,824 $ 936,749
Credit card and other consumer | Credit Card Receivable | United States    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 94,790 96,285
Credit card and other consumer | Credit Card Receivable | United States | Less than 620    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 4,504 4,730
Credit card and other consumer | Credit Card Receivable | United States | Greater than or equal to 620 and less than 680    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 11,810 12,422
Credit card and other consumer | Credit Card Receivable | United States | Greater than or equal to 680 and less than 740    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 34,852 35,656
Credit card and other consumer | Credit Card Receivable | United States | Greater than or equal to 740    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 43,624 43,477
Credit card and other consumer | Credit Card Receivable | United States | Other internal credit metrics    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 0 0
Credit card and other consumer | Direct/Indirect Consumer    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 92,621 96,342
Securities based lending overcollateralized 41,300 42,800
Credit card and other consumer | Direct/Indirect Consumer | Less than 620    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,588 1,680
Credit card and other consumer | Direct/Indirect Consumer | Greater than or equal to 620 and less than 680    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 1,854 2,143
Credit card and other consumer | Direct/Indirect Consumer | Greater than or equal to 680 and less than 740    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 11,193 12,304
Credit card and other consumer | Direct/Indirect Consumer | Greater than or equal to 740    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 35,949 36,759
Credit card and other consumer | Direct/Indirect Consumer | Other internal credit metrics    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 42,037 43,456
Credit card and other consumer | Other consumer    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 167 166
Credit card and other consumer | Other consumer | Less than 620    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 0 0
Credit card and other consumer | Other consumer | Greater than or equal to 620 and less than 680    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 0 0
Credit card and other consumer | Other consumer | Greater than or equal to 680 and less than 740    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 0 0
Credit card and other consumer | Other consumer | Greater than or equal to 740    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases 0 0
Credit card and other consumer | Other consumer | Other internal credit metrics    
Financing Receivable, Recorded Investment [Line Items]    
Loans and leases $ 167 $ 166