| Line Item | Dec 31, 2025 | Dec 31, 2024 | Dec 31, 2023 | Dec 31, 2022 | Dec 31, 2021 | Dec 31, 2020 | Dec 31, 2019 | Dec 31, 2018 | Dec 31, 2017 |
|---|---|---|---|---|---|---|---|---|---|
| Profit or loss [abstract] | |||||||||
| Net interest income | |||||||||
| – interest income | |||||||||
| – interest expense | |||||||||
| Net fee income | |||||||||
| – fee income | |||||||||
| – fee expense | |||||||||
| Net income from financial instruments held for trading or managed on a fair value basis | |||||||||
| Operating profit | |||||||||
| Share of profit in associates and joint ventures | |||||||||
| Impairment of interest in associate | |||||||||
| Profit before tax | |||||||||
| Profit for the year | |||||||||
| Attributable to: | |||||||||
| – ordinary shareholders of the parent company | |||||||||
| – other equity holders | |||||||||
| – non-controlling interests | |||||||||
| – profit for the year |