Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
Securitizations and Other Variable Interest Entities - Other Variable Interest Entities, Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Variable Interest Entity [Line Items]      
Total assets $ 2,281,234 $ 2,188,067  
Consolidated VIEs      
Variable Interest Entity [Line Items]      
Total assets 56,155 62,526  
Customer Vehicles      
Variable Interest Entity [Line Items]      
Maximum loss exposure 2,300 2,900  
Liquidity commitments to unconsolidated securitization trusts 442 323  
Collateralized Debt Obligations      
Variable Interest Entity [Line Items]      
Maximum loss exposure 358 430  
Investment Vehicles      
Variable Interest Entity [Line Items]      
Maximum loss exposure 5,700 5,100  
Investment Vehicles | Consolidated VIEs      
Variable Interest Entity [Line Items]      
Total assets 249 846  
Investment Vehicles | Unconsolidated VIEs      
Variable Interest Entity [Line Items]      
Maximum loss exposure 50 150  
Total assets 20,300 17,300  
Consolidated total assets of VIEs 39 75  
Leveraged Lease Trusts | Consolidated VIEs      
Variable Interest Entity [Line Items]      
Total assets 2,000 2,600  
Tax Credit Vehicles      
Investments in Affordable Housing Projects [Abstract]      
Unfunded commitments $ 3,100 2,700  
Unfunded commitment payment period 5 years    
Tax credits and other benefits $ 1,000 1,100 $ 928
Expected tax benefits recognized, as a percentage 25.00%    
Tax Credit Vehicles | Other income      
Investments in Affordable Housing Projects [Abstract]      
Pretax losses $ 766 789 $ 629
Tax Credit Vehicles | Other assets      
Investments in Affordable Housing Projects [Abstract]      
Investments in affordable housing project investments 8,000 7,400  
Tax Credit Vehicles | Unconsolidated VIEs      
Variable Interest Entity [Line Items]      
Maximum loss exposure $ 13,800 $ 12,600