Segmental analysis - Constant currency results reconciliation (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 |
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| Disclosure of operating segments [line items] | |||||||||
| Revenue | [1] | $ 68,274 | $ 65,854 | $ 66,058 | |||||
| ECL | (3,850) | (3,414) | (3,447) | ||||||
| Operating expenses | (36,428) | (33,043) | (32,070) | ||||||
| Share of profit/(loss) in associates and joint ventures less impairment | 1,911 | 2,912 | (193) | ||||||
| Profit before tax | 29,907 | 32,309 | 30,348 | ||||||
| Reclassification adjustments of other reserves losses of net investments in foreign operations, before tax | (1,104) | 0 | 0 | ||||||
| Impairment of interest in associate | [2] | 1,000 | 0 | 3,000 | |||||
| UK | |||||||||
| Disclosure of operating segments [line items] | |||||||||
| Revenue | 13,677 | 12,307 | 11,027 | ||||||
| Bank Of Communications Co., Limited | |||||||||
| Disclosure of operating segments [line items] | |||||||||
| ECL | $ (7,056) | $ (7,410) | |||||||
| Reclassification adjustments of other reserves losses of net investments in foreign operations, before tax | 1,100 | ||||||||
| Impairment loss recognised in profit or loss | $ 4,139 | $ 2,917 | 1,000 | 0 | 3,000 | ||||
| Constant currency | |||||||||
| Disclosure of operating segments [line items] | |||||||||
| Revenue | 68,274 | 66,009 | 65,040 | ||||||
| ECL | (3,850) | (3,392) | (3,250) | ||||||
| Operating expenses | (36,428) | (33,146) | (31,691) | ||||||
| Share of profit/(loss) in associates and joint ventures less impairment | 2,913 | (297) | |||||||
| Profit before tax | $ 29,907 | 32,384 | 29,802 | ||||||
| Currency translation | |||||||||
| Disclosure of operating segments [line items] | |||||||||
| Revenue | 155 | (1,018) | |||||||
| ECL | 22 | 197 | |||||||
| Operating expenses | (103) | 379 | |||||||
| Share of profit/(loss) in associates and joint ventures less impairment | 1 | (104) | |||||||
| Profit before tax | $ 75 | $ (546) | |||||||
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