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 ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Unconsolidated VIEs          
Variable Interest Entity [Line Items]          
Liquidity commitments to unconsolidated securitization trusts $ 1,000,000,000.0   $ 1,000,000,000.0   $ 218,000,000
Credit Card Receivable          
Variable Interest Entity [Line Items]          
Principal balance outstanding $ 7,400,000,000   $ 7,400,000,000   7,700,000,000
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     $ 1,300,000,000 $ 4,000,000,000.0  
Credit Card Receivable | Junior Lien          
Variable Interest Entity [Line Items]          
Transferred financial assets, amount issued     202,000,000 650,000,000  
Resecuritization Trusts          
Variable Interest Entity [Line Items]          
Cash proceeds from new securitizations $ 5,200,000,000 $ 7,700,000,000 13,700,000,000 21,300,000,000  
Resecuritization Trusts | Debt securities          
Variable Interest Entity [Line Items]          
Cash proceeds from new securitizations 750,000,000 $ 1,500,000,000 3,500,000,000 $ 3,700,000,000  
Municipal Bond Trusts | Unconsolidated VIEs          
Variable Interest Entity [Line Items]          
Liquidity commitments to unconsolidated securitization trusts $ 3,400,000,000   $ 3,400,000,000   $ 2,100,000,000
Weighted average remaining life of bonds held in the trusts in years     10 years 9 months 18 days