Quarterly report pursuant to Section 13 or 15(d)

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

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Securitizations and Other Variable Interest Entities - Other Variable Interest Entities, 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
Variable Interest Entity [Line Items]          
Total assets $ 2,291,670 $ 2,254,714 $ 2,291,670 $ 2,254,714 $ 2,281,234
Consolidated VIEs          
Variable Interest Entity [Line Items]          
Total assets 50,615   50,615   56,155
Customer Vehicles          
Variable Interest Entity [Line Items]          
Maximum loss exposure 2,200   2,200   2,300
Collateralized Debt Obligations          
Variable Interest Entity [Line Items]          
Maximum loss exposure 444   444   358
Investment Vehicles          
Variable Interest Entity [Line Items]          
Maximum loss exposure 6,000   6,000   5,700
Investment Vehicles | Consolidated VIEs          
Variable Interest Entity [Line Items]          
Total assets 243   243   249
Investment Vehicles | Unconsolidated VIEs          
Variable Interest Entity [Line Items]          
Total assets 33,800   33,800   20,300
Leveraged Lease Trusts | Consolidated VIEs          
Variable Interest Entity [Line Items]          
Total assets 1,900   1,900   2,000
Tax Credit Vehicles          
Investments in Affordable Housing Projects [Abstract]          
Unfunded commitments 3,600   $ 3,600   3,100
Unfunded commitment payment period     5 years    
Tax credits and other benefits 237 281 $ 485 532  
Expected tax benefits recognized, as a percentage     25.00%    
Tax Credit Vehicles | Other income          
Investments in Affordable Housing Projects [Abstract]          
Pretax losses 217 $ 207 $ 425 $ 403  
Tax Credit Vehicles | Other assets          
Investments in Affordable Housing Projects [Abstract]          
Investments in affordable housing project investments 8,400   8,400   8,000
Tax Credit Vehicles | Unconsolidated VIEs          
Variable Interest Entity [Line Items]          
Maximum loss exposure $ 14,600   $ 14,600   $ 13,800