Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Unconsolidated VIEs      
Variable Interest Entity [Line Items]      
Liquidity commitments to unconsolidated securitization trusts $ 218 $ 442  
Credit Card Receivable      
Variable Interest Entity [Line Items]      
Principal balance outstanding $ 7,700 7,400  
Transferred financial assets, stated interest rate 0.00%    
Credit Card Receivable | Senior Lien      
Variable Interest Entity [Line Items]      
Transferred financial assets, amount issued $ 4,000 3,100 $ 750
Credit Card Receivable | Junior Lien      
Variable Interest Entity [Line Items]      
Transferred financial assets, amount issued 650 500 121
Resecuritization Trusts      
Variable Interest Entity [Line Items]      
Cash proceeds from new securitizations 22,800 25,100 23,400
Resecuritization Trusts | Debt securities      
Variable Interest Entity [Line Items]      
Cash proceeds from new securitizations 4,100 3,300 $ 3,300
Municipal Bond Trusts | Unconsolidated VIEs      
Variable Interest Entity [Line Items]      
Liquidity commitments to unconsolidated securitization trusts $ 2,100 $ 1,600  
Weighted average remaining life of bonds held in the trusts in years 7 years 3 months 18 days