Credit Concentrations - Credit Concentrations Included in Trading Cash Instruments and Investments (Detail) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| U.S. government and agency obligations | ||
| Concentration Risk [Line Items] | ||
| Concentration risk, credit risk, financial instrument, maximum exposure | $ 391,750 | $ 389,148 |
| Concentration risk, credit risk, financial instrument, maximum exposure, as a percentage of total assets | 21.70% | 23.20% |
| Non-U.S. government obligations | ||
| Concentration Risk [Line Items] | ||
| Concentration risk, credit risk, financial instrument, maximum exposure | $ 112,031 | $ 74,496 |
| Concentration risk, credit risk, financial instrument, maximum exposure, as a percentage of total assets | 6.20% | 4.40% |