Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Securitizations and Other Variable Interest Entities - Other Asset-backed Securitizations, Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Unconsolidated VIEs          
Variable Interest Entity [Line Items]          
Liquidity commitments to unconsolidated securitization trusts $ 271   $ 271   $ 442
Credit Card Receivable          
Variable Interest Entity [Line Items]          
Principal balance outstanding $ 7,700   $ 7,700   7,400
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     $ 4,000 $ 3,100  
Credit Card Receivable | Junior Lien          
Variable Interest Entity [Line Items]          
Transferred financial assets, amount issued     650 500  
Resecuritization Trusts          
Variable Interest Entity [Line Items]          
Cash proceeds from new securitizations $ 7,700 $ 5,000 21,300 20,100  
Resecuritization Trusts | Debt securities          
Variable Interest Entity [Line Items]          
Cash proceeds from new securitizations 1,500 $ 855 3,700 $ 2,700  
Municipal Bond Trusts | Unconsolidated VIEs          
Variable Interest Entity [Line Items]          
Liquidity commitments to unconsolidated securitization trusts $ 1,800   $ 1,800   $ 1,600
Weighted average remaining life of bonds held in the trusts in years     6 years 3 months 3 days