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Share-based payments - Movements of share options (Details)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
EquityInstruments
CNY (¥)
¥ / shares
Dec. 31, 2021
EquityInstruments
CNY (¥)
¥ / shares
Dec. 31, 2020
EquityInstruments
Disclosure of terms and conditions of share-based payment arrangement      
At the beginning of the year | ¥ 12,725,995    
At the end of the year | ¥ 10,137,344 12,725,995  
Disclosure of number and weighted average remaining contractual life of outstanding share options      
Weighted-average exercise price | ¥ / shares ¥ 21.00 ¥ 24.85  
Weighted-average remaining contractual life 3 years 3 months 10 days 4 years 4 months 9 days  
Stock options      
Disclosure of terms and conditions of share-based payment arrangement      
At the beginning of the year 12,725,995 19,459,994 24,470,325
Exercised (621,930) (5,181,306)  
Forfeited (1,966,721) (1,552,693) (5,010,331)
At the end of the year 10,137,344 12,725,995 19,459,994