Financial assets held under resale agreements - Additional Information (Detail) - CNY (¥) |
Dec. 31, 2024 |
Dec. 31, 2023 |
Dec. 31, 2022 |
|---|---|---|---|
| Schedule of financial instruments held under resale agreements [Line Items] | |||
| Financial Assets Held Under Resale Agreement Past Due | ¥ 0 | ¥ 0 | ¥ 0 |
| Collateral pledged in stock exchange pool carrying amount | ¥ 1,179,000,000 | ¥ 563,000,000 |