Trading Assets and Liabilities - Gains and Losses from Market Making (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
|
| Trading activity, gains and losses, net [Line Items] | ||||
| Market making | $ 3,929 | $ 3,327 | $ 13,096 | $ 12,796 |
| Interest Rates [Member] | ||||
| Trading activity, gains and losses, net [Line Items] | ||||
| Market making | (1,249) | 1,732 | (1,572) | 3,784 |
| Credit [Member] | ||||
| Trading activity, gains and losses, net [Line Items] | ||||
| Market making | 162 | 578 | 1,324 | 3,571 |
| Currencies [Member] | ||||
| Trading activity, gains and losses, net [Line Items] | ||||
| Market making | 1,779 | (981) | 4,521 | (1,674) |
| Equities [Member] | ||||
| Trading activity, gains and losses, net [Line Items] | ||||
| Market making | 2,521 | 1,391 | 6,839 | 5,022 |
| Commodities [Member] | ||||
| Trading activity, gains and losses, net [Line Items] | ||||
| Market making | $ 716 | $ 607 | $ 1,984 | $ 2,093 |