Annual report pursuant to Section 13 and 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 ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Home equity lines of credit    
Variable Interest Entity [Line Items]    
Trust certificates outstanding $ 4,000,000,000 $ 5,800,000,000
Remaining borrowing capacity on home equity line 7,000,000 39,000,000
Assets of deconsolidated securitization vehicles 488,000,000  
Liabilities of deconsolidated securitization vehicles 611,000,000  
Gain (loss) on deconsolidation 123,000,000  
Credit Card Receivable    
Variable Interest Entity [Line Items]    
Principal balance outstanding $ 7,500,000,000 7,400,000,000
Transferred financial assets, stated interest rate 0.00%  
Credit Card Receivable | Senior Lien    
Variable Interest Entity [Line Items]    
Transferred financial assets, amount issued $ 2,300,000,000 4,100,000,000
Credit Card Receivable | Junior Lien    
Variable Interest Entity [Line Items]    
Transferred financial assets, amount issued 371,000,000 662,000,000
Resecuritization Trusts    
Variable Interest Entity [Line Items]    
Cash proceeds from new securitizations 30,700,000,000 14,400,000,000
Resecuritization Trusts | Available-for-sale Securities    
Variable Interest Entity [Line Items]    
Cash proceeds from new securitizations 0 1,500,000,000
Gain on sale of investments   71,000,000
Resecuritization Trusts | Debt securities    
Variable Interest Entity [Line Items]    
Cash proceeds from new securitizations 9,800,000,000 4,600,000,000
Resecuritization Trusts | Held-to-maturity Securities    
Variable Interest Entity [Line Items]    
Cash proceeds from new securitizations 6,900,000,000 747,000,000
Municipal Bond Trusts | Unconsolidated VIEs    
Variable Interest Entity [Line Items]    
Liquidity commitments to unconsolidated securitization trusts $ 1,600,000,000 2,100,000,000
Weighted average remaining life of bonds held in the trusts in years 7 years 4 months 24 days  
Automobile and Other Securitization Trusts    
Variable Interest Entity [Line Items]    
Principal balance outstanding $ 314,000,000 1,900,000,000
Automobile Loan    
Variable Interest Entity [Line Items]    
Principal balance outstanding 125,000,000 400,000,000
Other Loan and Receivable    
Variable Interest Entity [Line Items]    
Principal balance outstanding 189,000,000 876,000,000
Student Loan    
Variable Interest Entity [Line Items]    
Assets of deconsolidated securitization vehicles 515,000,000  
Liabilities of deconsolidated securitization vehicles 449,000,000  
Gain (loss) on deconsolidation 0  
Principal balance outstanding $ 0 $ 609,000,000