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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 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 $ 7,500   $ 7,500   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     $ 2,800 $ 2,000  
Credit Card Receivable | Junior Lien          
Variable Interest Entity [Line Items]          
Transferred financial assets, amount issued     448 323  
Resecuritization Trusts          
Variable Interest Entity [Line Items]          
Cash proceeds from new securitizations $ 6,800 $ 7,300 13,600 15,100  
Resecuritization Trusts | Debt securities          
Variable Interest Entity [Line Items]          
Cash proceeds from new securitizations 910 $ 1,100 2,200 $ 1,800  
Municipal Bond Trusts | Unconsolidated VIEs          
Variable Interest Entity [Line Items]          
Liquidity commitments to unconsolidated securitization trusts $ 1,700   $ 1,700   $ 1,600
Weighted average remaining life of bonds held in the trusts in years     6 years 1 month 6 days