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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Home equity          
Variable Interest Entity [Line Items]          
Trust certificates outstanding $ 3,600,000,000   $ 3,600,000,000   $ 4,000,000,000
Remaining borrowing capacity on home equity line 5,000,000   5,000,000   7,000,000
Credit Card Receivable          
Variable Interest Entity [Line Items]          
Principal amount outstanding $ 7,500,000,000   $ 7,500,000,000   $ 7,500,000,000
Transferred financial assets, stated interest rate 0.00%   0.00%   0.00%
Credit Card Receivable | Senior Lien          
Variable Interest Entity [Line Items]          
Transferred financial assets, amount issued $ 750,000,000 $ 1,200,000,000 $ 750,000,000 $ 2,300,000,000  
Credit Card Receivable | Junior Lien          
Variable Interest Entity [Line Items]          
Transferred financial assets, amount issued 121,000,000 194,000,000 121,000,000 371,000,000  
Resecuritization Trusts          
Variable Interest Entity [Line Items]          
Cash proceeds from new securitizations 8,100,000,000 6,900,000,000 14,700,000,000 13,000,000,000  
Resecuritization Trusts | Available-for-sale Securities          
Variable Interest Entity [Line Items]          
Cash proceeds from new securitizations 0 0 0 0  
Resecuritization Trusts | Debt securities          
Variable Interest Entity [Line Items]          
Cash proceeds from new securitizations 1,100,000,000 973,000,000 2,200,000,000 1,600,000,000  
Resecuritization Trusts | Other Security Investments          
Variable Interest Entity [Line Items]          
Gain on sale of investments 0 $ 0 0 $ 0  
Municipal Bond Trusts | Unconsolidated VIEs          
Variable Interest Entity [Line Items]          
Liquidity commitments to unconsolidated securitization trusts 1,500,000,000   $ 1,500,000,000   $ 1,600,000,000
Weighted average remaining life of bonds held in the trusts in years     6 years 10 months 24 days    
Automobile and Other Securitization Trusts          
Variable Interest Entity [Line Items]          
Principal amount outstanding 184,000,000   $ 184,000,000   314,000,000
Other Loan and Receivable          
Variable Interest Entity [Line Items]          
Principal amount outstanding 184,000,000   184,000,000   189,000,000
Automobile Loan          
Variable Interest Entity [Line Items]          
Principal amount outstanding $ 0   $ 0   $ 125,000,000