Collateralized Agreements and Financings - Other Secured Financings (Parenthetical) (Detail) - USD ($) $ in Millions |
Dec. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Other Secured Financings [Line Items] | ||
| Nonrecourse obligations included in other secured financings | $ 12,310 | $ 10,910 |
| Transfers of financial assets accounted for as financings included in other secured financings | 2,050 | 2,160 |
| Financial assets collateralizing other secured financings related to failed sales | 2,260 | 2,210 |
| Other secured financings collateralized by financial instruments owned | 11,280 | 9,090 |
| Other secured financings collateralized by financial instruments received as collateral and repledged | $ 5,630 | $ 2,930 |
| U.S. Dollar [Member] | ||
| Other Secured Financings [Line Items] | ||
| Weighted average interest rates | 1.27% | 2.79% |
| Weighted average interest rates | 4.32% | |
| Non-U.S. Dollar [Member] | ||
| Other Secured Financings [Line Items] | ||
| Weighted average interest rates | 0.40% | 0.39% |