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Other reserves - Others (Details) - CNY (¥)
12 Months Ended
Aug. 17, 2020
Jan. 14, 2020
Dec. 31, 2020
Disclosure of reserves within equity [line items]      
Issuance of ordinary shares     ¥ 2,697,679,000
Over-allotment options      
Disclosure of reserves within equity [line items]      
Total consideration   ¥ 225,727,710  
Issuance of ordinary shares   728  
Share premium   ¥ 225,727,000  
Underwritten public offerings      
Disclosure of reserves within equity [line items]      
Total consideration ¥ 2,471,951,645    
Issuance of ordinary shares 4,305    
Share premium ¥ 2,471,947,000