Quarterly report pursuant to Section 13 or 15(d)

Securitizations and Other Variable Interest Entities - Other Asset-backed Securitizations Additional Information (Details)

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Securitizations and Other Variable Interest Entities - Other Asset-backed Securitizations Additional Information (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Home equity      
Variable Interest Entity [Line Items]      
Trust certificates outstanding $ 3,800,000,000   $ 4,000,000,000
Remaining borrowing capacity on home equity line 6,000,000   7,000,000
Credit Card Receivable      
Variable Interest Entity [Line Items]      
Principal amount outstanding $ 7,300,000,000   7,500,000,000
Transferred financial assets, stated interest rate 0.00%    
Credit Card Receivable | Senior Lien      
Variable Interest Entity [Line Items]      
Transferred financial assets, amount issued $ 0 $ 1,100,000,000  
Credit Card Receivable | Junior Lien      
Variable Interest Entity [Line Items]      
Transferred financial assets, amount issued 0 178,000,000  
Resecuritization Trusts      
Variable Interest Entity [Line Items]      
Cash proceeds from new securitizations 6,600,000,000 6,100,000,000  
Resecuritization Trusts | Available-for-sale Securities      
Variable Interest Entity [Line Items]      
Cash proceeds from new securitizations 0 0  
Resecuritization Trusts | Debt securities      
Variable Interest Entity [Line Items]      
Cash proceeds from new securitizations 1,000,000,000 669,000,000  
Resecuritization Trusts | Other Security Investments      
Variable Interest Entity [Line Items]      
Gain on sale of investments 0 $ 0  
Municipal Bond Trusts | Unconsolidated VIEs      
Variable Interest Entity [Line Items]      
Liquidity commitments to unconsolidated securitization trusts $ 1,500,000,000   1,600,000,000
Weighted average remaining life of bonds held in the trusts in years 7 years 8 months 12 days    
Automobile and Other Securitization Trusts      
Variable Interest Entity [Line Items]      
Principal amount outstanding $ 183,000,000   314,000,000
Other Loan and Receivable      
Variable Interest Entity [Line Items]      
Principal amount outstanding 183,000,000   189,000,000
Automobile Loan      
Variable Interest Entity [Line Items]      
Principal amount outstanding $ 0   $ 125,000,000