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Fair value estimation - Additional Information (Detail) - Level 3 - CNY (¥)
¥ in Millions
6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Disclosure of fair value measurement of assets [line items]    
Financial instruments acquired through business combination ¥ 3.3  
Change in fair value from remeasurement of financial assets through profit or loss ¥ 1.2 ¥ 1.8