Taxation - Income taxes (Details) - HKD ($) $ in Millions |
12 Months Ended | 24 Months Ended | ||
|---|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2025 |
|
| Effective Income Tax Rate Reconciliation [Line Items] | ||||
| Statutory EIT rate (in percent) | 25.00% | 25.00% | ||
| One Subsidiary | ||||
| Effective Income Tax Rate Reconciliation [Line Items] | ||||
| Statutory EIT rate (in percent) | 25.00% | |||
| Preferential tax rate (in percent) | 15.00% | 15.00% | 15.00% | |
| Hong Kong | Assessable profits up to HK$2 million | ||||
| Effective Income Tax Rate Reconciliation [Line Items] | ||||
| Maximum amount of assessable profits | $ 2 | |||
| Statutory EIT rate (in percent) | 8.25% | |||
| Hong Kong | Assessable profits over HK$2 million | ||||
| Effective Income Tax Rate Reconciliation [Line Items] | ||||
| Maximum amount of assessable profits | $ 2 | |||
| Statutory EIT rate (in percent) | 16.50% | |||
| China | ||||
| Effective Income Tax Rate Reconciliation [Line Items] | ||||
| Statutory EIT rate (in percent) | 25.00% | |||