Interest in associates and joint ventures - Share of profit in associates and joint ventures (Details) - USD ($) $ in Millions |
9 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2024 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Disclosure of associates [line items] | |||||
| Share of profit in associates and joint ventures | $ 2,911 | $ 2,912 | $ 2,807 | ||
| Bank Of Communications Co., Limited | |||||
| Disclosure of associates [line items] | |||||
| Share of profit in associates and joint ventures | 2,132 | 2,241 | 2,250 | ||
| Impairment | $ (4,139) | $ (2,917) | (1,000) | 0 | (3,000) |
| Saudi Awwal Bank | |||||
| Disclosure of associates [line items] | |||||
| Share of profit in associates and joint ventures | 665 | 596 | 538 | ||
| Other associates and joint ventures | |||||
| Disclosure of associates [line items] | |||||
| Share of profit in associates and joint ventures | $ 114 | $ 75 | $ 19 | ||