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Financial assets at fair value through other comprehensive income - Disclosure Of Voluntary Debt Swap (parenthetical) (Details) | Jun. 30, 2023 | Mar. 31, 2023
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April 14, 2024 [member] |  |
Disclosure Of Voluntary Debt Swap [Line Items] |  |
Derivatives percentage contributed to fair value of other comprehensive income |  | 3.75%
October 14, 2024 [member] |  |
Disclosure Of Voluntary Debt Swap [Line Items] |  |
Derivatives percentage contributed to fair value of other comprehensive income |  | 4.00%
February 14, 2025 [member] |  |
Disclosure Of Voluntary Debt Swap [Line Items] |  |
Derivatives percentage contributed to fair value of other comprehensive income |  | 4.25%
August 13, 2023 [member] |  |
Disclosure Of Voluntary Debt Swap [Line Items] |  |
Derivatives percentage contributed to fair value of other comprehensive income | 1.45% |
December 13, 2024 [member] |  |
Disclosure Of Voluntary Debt Swap [Line Items] |  |
Derivatives percentage contributed to fair value of other comprehensive income | 4.25% |

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