Funding from Group measured at amortized cost (Detail) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Disclosure Of Funding From Group [Line Items] | ||
| Debt contributing to total loss-absorbing capacity (TLAC) | $ 86,859 | $ 83,773 |
| Debt eligible as high-trigger loss-absorbing additional tier 1 capital instruments | 23,144 | 19,600 |
| Other | 724 | 7,242 |
| Total | 110,727 | 110,614 |
| Contingent capital instruments that are subject to equity conversion upon the occurrence of a contractual trigger event or a contractual viability event | 18,000 | 13,000 |
| Contingent capital instruments that are subject to write-down upon the occurrence of a contractual trigger event or a contractual viability event | $ 6,000 | $ 6,600 |