Tax - Tax reconciliation, narrative (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Summary Of Income Taxes [Line Items] | |||
| Applicable tax rate | 25.00% | 25.00% | 23.50% |
| Average effective tax rate | 22.70% | 22.60% | 19.10% |
| Tax rate effect of gain (loss) on pillar two global minimum tax charge | 0.70% | ||
| – impairment of investment in BoCom | 0.80% | 0.00% | 2.30% |
| – movements in provisions for uncertain tax positions | 0.40% | 0.10% | (1.60%) |
| – accounting gain on acquisition of SVB UK | 0.00% | 0.00% | (1.50%) |
| – Pillar 2 and qualifying domestic top-up taxes | $ 48 | $ 221 | $ 0 |
| Exposures to legacy tax cases | $ 118 | ||
| Pro Forma | |||
| Summary Of Income Taxes [Line Items] | |||
| Average effective tax rate | 21.20% | 21.40% | |
| Hong Kong | |||
| Summary Of Income Taxes [Line Items] | |||
| Applicable tax rate | 16.50% | 16.50% | 16.50% |
| United States | |||
| Summary Of Income Taxes [Line Items] | |||
| Applicable tax rate | 21.00% | ||
| UK | |||
| Summary Of Income Taxes [Line Items] | |||
| Applicable tax rate | 25.00% | ||