Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Securitizations and Other Variable Interest Entities - Other Asset-backed Securitizations, Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Credit Card Receivable          
Variable Interest Entity [Line Items]          
Principal balance outstanding $ 7,400   $ 7,400   $ 7,500
Transferred financial assets, stated interest rate 0.00%   0.00%    
Credit Card Receivable | Senior Lien          
Variable Interest Entity [Line Items]          
Transferred financial assets, amount issued     $ 3,100 $ 750  
Credit Card Receivable | Junior Lien          
Variable Interest Entity [Line Items]          
Transferred financial assets, amount issued     500 121  
Resecuritization Trusts          
Variable Interest Entity [Line Items]          
Cash proceeds from new securitizations $ 5,000 $ 5,600 20,100 20,300  
Resecuritization Trusts | Debt securities          
Variable Interest Entity [Line Items]          
Cash proceeds from new securitizations 855 $ 430 2,700 $ 2,600  
Municipal Bond Trusts | Unconsolidated VIEs          
Variable Interest Entity [Line Items]          
Liquidity commitments to unconsolidated securitization trusts $ 1,600   $ 1,600   $ 1,600
Weighted average remaining life of bonds held in the trusts in years     5 years 7 months 6 days