Collateralized Agreements and Financings - Other Secured Financings (Parenthetical) (Detail) - USD ($) $ in Millions |
Jun. 30, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Other Secured Financings [Line Items] | ||
| Nonrecourse obligations included in other secured financings | $ 10,790 | $ 12,310 |
| Transfers of financial assets accounted for as financings included in other secured financings | 1,730 | 2,050 |
| Financial assets collateralizing other secured financings related to failed sales | 1,810 | 2,260 |
| Other secured financings collateralized by financial instruments owned | 14,190 | 11,280 |
| Other secured financings collateralized by financial instruments received as collateral and repledged | $ 5,620 | $ 5,630 |
| U.S. Dollar [Member] | ||
| Other Secured Financings [Line Items] | ||
| Weighted average interest rates | 0.59% | 1.27% |
| Weighted average interest rates | 2.54% | |
| Non-U.S. Dollar [Member] | ||
| Other Secured Financings [Line Items] | ||
| Weighted average interest rates | 0.39% | 0.40% |