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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Unconsolidated VIEs          
Variable Interest Entity [Line Items]          
Liquidity commitments to unconsolidated securitization trusts $ 918,000,000   $ 918,000,000   $ 1,100,000,000
Held-to-maturity Securities          
Variable Interest Entity [Line Items]          
Securities received as resecuritization proceeds     1,700,000,000    
Credit Card          
Variable Interest Entity [Line Items]          
Principal balance outstanding $ 6,900,000,000   $ 6,900,000,000   $ 7,400,000,000
Transferred financial assets, stated interest rate 0.00%   0.00%   0.00%
Credit Card | Senior Lien          
Variable Interest Entity [Line Items]          
Transferred financial assets, amount     $ 0 $ 1,300,000,000  
Credit Card | Junior Lien          
Variable Interest Entity [Line Items]          
Transferred financial assets, amount     0 202,000,000  
Resecuritization Trusts          
Variable Interest Entity [Line Items]          
Cash proceeds from new securitizations $ 8,300,000,000 $ 5,200,000,000 26,400,000,000 13,700,000,000  
Resecuritization Trusts | Debt securities          
Variable Interest Entity [Line Items]          
Cash proceeds from new securitizations 598,000,000 $ 750,000,000 5,500,000,000 $ 3,500,000,000  
Municipal Bond Trusts | Unconsolidated VIEs          
Variable Interest Entity [Line Items]          
Liquidity commitments to unconsolidated securitization trusts $ 3,300,000,000   $ 3,300,000,000   $ 3,700,000,000
Weighted average remaining life of bonds held in the trusts in years     6 years 10 months 24 days    
Level 2 | Trading account assets          
Variable Interest Entity [Line Items]          
Securities received as resecuritization proceeds     $ 1,800,000,000    
Level 2 | Debt Securities Carried at Fair Value          
Variable Interest Entity [Line Items]          
Securities received as resecuritization proceeds     $ 2,100,000,000