FVM - Financial instruments not measured at fair value - Assets (Detail) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Disclosure Of Financial Instruments [Abstract] | ||
| Cash and balances at central banks | $ 215,716 | $ 209,858 |
| Amounts due from banks | 20,514 | 19,243 |
| Receivables from securities financing transactions measured at amortized cost | 83,553 | 83,656 |
| Cash collateral receivables on derivative instruments | 51,314 | 41,552 |
| Loans and advances to customers | 667,391 | 658,760 |
| Other financial assets measured at amortized cost | 72,437 | 72,025 |
| Fair value | ||
| Disclosure Of Financial Instruments [Abstract] | ||
| Cash and balances at central banks | 215,700 | 209,900 |
| Amounts due from banks | 20,500 | 19,200 |
| Receivables from securities financing transactions measured at amortized cost | 83,600 | 83,700 |
| Cash collateral receivables on derivative instruments | 51,300 | 41,600 |
| Loans and advances to customers | 658,000 | 650,200 |
| Other financial assets measured at amortized cost | $ 71,400 | $ 71,300 |