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, 2016
Dec. 31, 2015
Dec. 31, 2014
Variable Interest Entity [Line Items]      
Payments to fund trust securitization $ 1,000,000 $ 7,000,000  
Home equity lines of credit      
Variable Interest Entity [Line Items]      
Trust certificates outstanding 2,700,000,000 4,000,000,000  
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 7,500,000,000  
Transferred financial assets, stated interest rate 0.00%    
Credit Card Receivable | Senior Lien      
Variable Interest Entity [Line Items]      
Transferred financial assets, amount issued $ 750,000,000 2,300,000,000  
Credit Card Receivable | Junior Lien      
Variable Interest Entity [Line Items]      
Transferred financial assets, amount issued 121,000,000 371,000,000  
Resecuritization Trusts      
Variable Interest Entity [Line Items]      
Cash proceeds from new securitizations 23,400,000,000 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 0 1,500,000,000
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale, Gain (Loss) on Sale     85,000,000
Resecuritization Trusts | Debt securities      
Variable Interest Entity [Line Items]      
Cash proceeds from new securitizations 3,300,000,000 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 1,600,000,000  
Weighted average remaining life of bonds held in the trusts in years 5 years 7 months    
Automobile and Other Securitization Trusts      
Variable Interest Entity [Line Items]      
Principal balance outstanding $ 174,000,000 314,000,000  
Other Loan and Receivable      
Variable Interest Entity [Line Items]      
Principal balance outstanding 174,000,000 189,000,000  
Automobile Loan      
Variable Interest Entity [Line Items]      
Principal balance outstanding $ 0 125,000,000  
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