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 ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Home equity lines of credit      
Variable Interest Entity [Line Items]      
Trust certificates outstanding $ 2,400   $ 2,700
Payments to fund trust securitization 0 $ 1  
Credit Card Receivable      
Variable Interest Entity [Line Items]      
Principal balance outstanding $ 7,700   7,500
Transferred financial assets, stated interest rate 0.00%    
Credit Card Receivable | Senior Lien      
Variable Interest Entity [Line Items]      
Transferred financial assets, amount issued $ 2,000 0  
Credit Card Receivable | Junior Lien      
Variable Interest Entity [Line Items]      
Transferred financial assets, amount issued 323 0  
Resecuritization Trusts      
Variable Interest Entity [Line Items]      
Cash proceeds from new securitizations 7,800 6,600  
Resecuritization Trusts | Debt securities      
Variable Interest Entity [Line Items]      
Cash proceeds from new securitizations 734 $ 1,000  
Municipal Bond Trusts | Unconsolidated VIEs      
Variable Interest Entity [Line Items]      
Liquidity commitments to unconsolidated securitization trusts $ 1,600   $ 1,600
Weighted average remaining life of bonds held in the trusts in years 5 years 2 months