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Variable Interest Entities and Securitization Activities - Fair Value of Transfers of Assets with Continuing Involvement (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Variable Interest Entity    
Derivative assets $ 32,624 $ 29,173
Derivative liabilities 35,402 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 1,610 2,019
Interests purchased in the secondary market 328 299
Derivative assets 201 216
Derivative liabilities 69 178
SPE | Investment grade    
Variable Interest Entity    
Retained interests 1,492 1,593
Interests purchased in the secondary market 271 200
SPE | Non-investment grade    
Variable Interest Entity    
Retained interests 118 426
Interests purchased in the secondary market 57 99
SPE | Level 2    
Variable Interest Entity    
Retained interests 1,486 1,754
Interests purchased in the secondary market 305 276
Derivative assets 163 121
Derivative liabilities 65 175
SPE | Level 2 | Investment grade    
Variable Interest Entity    
Retained interests 1,475 1,580
Interests purchased in the secondary market 268 193
SPE | Level 2 | Non-investment grade    
Variable Interest Entity    
Retained interests 11 174
Interests purchased in the secondary market 37 83
SPE | Level 3    
Variable Interest Entity    
Retained interests 124 265
Interests purchased in the secondary market 23 23
Derivative assets 38 95
Derivative liabilities 4 3
SPE | Level 3 | Investment grade    
Variable Interest Entity    
Retained interests 17 13
Interests purchased in the secondary market 3 7
SPE | Level 3 | Non-investment grade    
Variable Interest Entity    
Retained interests 107 252
Interests purchased in the secondary market $ 20 $ 16