Quarterly report pursuant to Section 13 or 15(d)

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

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Outstanding Loans and Leases - Credit Card and Other Consumer - Impaired Loans (Details) - Credit card and other consumer - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]          
Fixed payment plan period for loans modified     60 months    
Direct/Indirect Consumer          
Unpaid Principal Balance          
With no recorded allowance $ 63   $ 63   $ 58
With an allowance recorded 0   0   1
Total 63   63   59
Carrying Value          
With no recorded allowance 29   29   28
With an allowance recorded 0   0   1
Total 29   29   29
Related Allowance 0   0   0
Average Carrying Value          
With no recorded allowance 30 $ 20 29 $ 19  
With an allowance recorded 1 2 1 2  
Total 31 22 30 21  
Interest Income Recognized          
With no recorded allowance 1 0 2 0  
With an allowance recorded 0 0 0 0  
Total 1 0 2 0  
United States | Credit Card Receivable          
Unpaid Principal Balance          
With an allowance recorded 501   501   454
Total 501   501   454
Carrying Value          
With an allowance recorded 512   512   461
Total 512   512   461
Related Allowance 143   143   $ 125
Average Carrying Value          
With an allowance recorded 498 457 481 466  
Total 498 457 481 466  
Interest Income Recognized          
With an allowance recorded 7 6 19 18  
Total 7 6 19 18  
Non United States | Credit Card Receivable          
Average Carrying Value          
With an allowance recorded 0 0 0    
With an allowance recorded       62  
Total, including loans held for sale       62  
Total 0 0 0    
Interest Income Recognized          
With an allowance recorded 0 0 0    
With an allowance recorded, including loans held for sale       1  
Total, including loans held for sale       $ 1  
Total $ 0 $ 0 $ 0