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Variable Interest Entities and Securitization Activities - Fair Value of Transfers of Assets with Continuing Involvement (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Variable Interest Entity    
Derivative assets $ 32,764 $ 29,173
Derivative liabilities 32,020 27,258
Derivative Liabilities    
Variable Interest Entity    
Derivative liability, balance only reported in assets sold with retained exposure table   119
UPB    
Variable Interest Entity    
Continuing involvement with transferred financial assets, principal amount outstanding, balance only reported in assets sold with retained exposure table   8,000
Derivative Assets    
Variable Interest Entity    
Derivative asset, balance only reported in assets sold with retained exposure table   20
SPE    
Variable Interest Entity    
Retained interests 600 2,019
Interests purchased in the secondary market 1,173 299
Derivative assets 85 216
Derivative liabilities 63 178
SPE | Investment grade    
Variable Interest Entity    
Retained interests 480 1,593
Interests purchased in the secondary market 1,102 200
SPE | Non-investment grade    
Variable Interest Entity    
Retained interests 120 426
Interests purchased in the secondary market 71 99
SPE | Level 2    
Variable Interest Entity    
Retained interests 490 1,754
Interests purchased in the secondary market 1,148 276
Derivative assets 11 121
Derivative liabilities 61 175
SPE | Level 2 | Investment grade    
Variable Interest Entity    
Retained interests 469 1,580
Interests purchased in the secondary market 1,095 193
SPE | Level 2 | Non-investment grade    
Variable Interest Entity    
Retained interests 21 174
Interests purchased in the secondary market 53 83
SPE | Level 3    
Variable Interest Entity    
Retained interests 110 265
Interests purchased in the secondary market 25 23
Derivative assets 74 95
Derivative liabilities 2 3
SPE | Level 3 | Investment grade    
Variable Interest Entity    
Retained interests 11 13
Interests purchased in the secondary market 7 7
SPE | Level 3 | Non-investment grade    
Variable Interest Entity    
Retained interests 99 252
Interests purchased in the secondary market $ 18 $ 16