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Share-based payments - Share options outstanding (Details)
12 Months Ended
Dec. 31, 2022
CNY (¥)
¥ / shares
Dec. 31, 2021
CNY (¥)
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]    
Number of share options 10,137,344,000 12,725,995,000
RMB1.33    
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]    
Exercise price | ¥ / shares ¥ 1.33  
Fair value of options ¥ 0.62  
Number of share options 977,951,000 1,109,682,000
RMB2.00    
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]    
Exercise price | ¥ / shares ¥ 2.00  
Fair value of options ¥ 0.52  
Number of share options 5,295,021,000 5,785,221,000
RMB 52.00, granted In 2018    
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]    
Exercise price | ¥ / shares ¥ 52.00  
Fair value of options ¥ 26.00  
Number of share options 3,044,462,000 4,704,219,000
RMB 52.00, granted In 2019    
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items]    
Exercise price | ¥ / shares ¥ 52.00  
Fair value of options ¥ 23.42  
Number of share options 819,910,000 1,126,873,000