Interest in associates and joint ventures - Reconciliation of BoCom's total shareholders' equity to carrying amount (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] | |||||
| Equity attributable to shareholders | $ 198,225 | $ 184,973 | |||
| Interests in associates | 29,469 | 28,777 | |||
| Gains (losses) on exchange differences on translation of foreign operations, net of tax | 6,563 | (4,983) | $ (204) | ||
| Bank Of Communications Co., Limited | |||||
| Disclosure of associates [line items] | |||||
| Equity attributable to shareholders | $ 183,347 | $ 154,748 | |||
| Other equity instruments | (20,708) | (23,946) | |||
| Equity attributable to shareholders less other equity instruments | 130,802 | 162,639 | |||
| The Group's share of equity | 25,284 | 26,595 | |||
| Impairment | (4,139) | (2,917) | (1,000) | 0 | $ (3,000) |
| Interests in associates | $ 22,456 | $ 22,367 | $ 22,456 | $ 22,367 | |