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Loans - Narrative and Balances By Portfolio Segment (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
loan_payment
payment
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Loan balances by portfolio segment:      
Retained $ 832,792 $ 747,508 $ 724,177
Held-for-sale 1,646 7,217  
At fair value 2,861 2,611  
Total $ 837,299 757,336  
Consumer, excluding credit card      
Loans and Leases Receivable Disclosure [Line Items]      
Period past due, credit analysis factors, charge off criteria 90 days    
Loan balances by portfolio segment:      
Retained $ 344,355 294,979 288,449
Held-for-sale 466 395  
At fair value 0 0  
Total $ 344,821 295,374  
Consumer, excluding credit card | Minimum      
Loans and Leases Receivable Disclosure [Line Items]      
Number of payments under modified terms to recognize interest on cash basis | loan_payment 6    
Credit card      
Loan balances by portfolio segment:      
Retained $ 131,387 128,027 127,465
Held-for-sale 76 3,021  
At fair value 0 0  
Total 131,463 131,048  
Wholesale      
Loan balances by portfolio segment:      
Retained 357,050 324,502 $ 308,263
Held-for-sale 1,104 3,801  
At fair value 2,861 2,611  
Total $ 361,015 330,914  
30 or more days past due | Consumer, excluding credit card      
Loans and Leases Receivable Disclosure [Line Items]      
Period past due, credit analysis factors, charge off criteria 30 days    
Consumer, excluding credit card      
Loan balances by portfolio segment:      
Total $ 344,821 295,374  
Consumer, excluding credit card | 90 or more days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Period past due, credit analysis factors, charge off criteria 90 days    
Consumer, excluding credit card | 30 or more days past due      
Loans and Leases Receivable Disclosure [Line Items]      
Period past due, credit analysis factors, charge off criteria 30 days    
Residential real estate loans, non-modified credit card loans and scored business ranking loans | Days Past Due, 180 or More      
Loans and Leases Receivable Disclosure [Line Items]      
Loans, charge-off criteria, period past due 180 days    
Credit card | Credit card      
Loan balances by portfolio segment:      
Retained $ 131,387 128,027  
Credit card | 90 or more days past due | Credit card      
Loans and Leases Receivable Disclosure [Line Items]      
Loans, charge-off criteria, period past due 90 days    
Credit card | 30 or more days past due | Credit card      
Loans and Leases Receivable Disclosure [Line Items]      
Loans, charge-off criteria, period past due 30 days    
Credit card | Days Past Due, 120 or More | Financing Receivable, Policy, Current      
Loans and Leases Receivable Disclosure [Line Items]      
Loans, charge-off criteria, period past due 120 days    
Auto and student loans | Days Past Due, 120 or More      
Loans and Leases Receivable Disclosure [Line Items]      
Loans, charge-off criteria, period past due 120 days    
Residential real estate and auto loans | Days Past Due, 60 or More, or Sooner with Determination of Collateral Dependence      
Loans and Leases Receivable Disclosure [Line Items]      
Period past due, credit analysis factors, charge off criteria 60 days    
Credit card and scored business loans | Days Until Charge-Off, Less Than 60, with Notification of Bankruptcy Filing or Other Event      
Loans and Leases Receivable Disclosure [Line Items]      
Period past due, credit analysis factors, charge off criteria 60 days    
Student loan securitization | Days Past Due, 60 or More, with Notification of Bankruptcy Filing or Other Event      
Loans and Leases Receivable Disclosure [Line Items]      
Period past due, credit analysis factors, charge off criteria 60 days    
Residential real estate      
Loans and Leases Receivable Disclosure [Line Items]      
Number of months the borrower has performed under modified terms 6 months    
Residential real estate | Maximum      
Loans and Leases Receivable Disclosure [Line Items]      
Number of months before updating exterior opinion on home valuation 6 months    
Residential real estate | Consumer, excluding credit card      
Loans and Leases Receivable Disclosure [Line Items]      
Number of payments under modified terms to recognize interest on cash basis | payment 6    
Loan balances by portfolio segment:      
Retained $ 211,798 162,719  
Real estate | Minimum      
Loans and Leases Receivable Disclosure [Line Items]      
Number of months before updating collateral values on commercial real estate loans 6 months    
Real estate | Maximum      
Loans and Leases Receivable Disclosure [Line Items]      
Number of months before updating collateral values on commercial real estate loans 12 months    
Real estate | Wholesale      
Loan balances by portfolio segment:      
Retained $ 92,820 $ 79,113