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Derivative financial assets and liabilities (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about financial instruments    
Derivative financial Liabilities, fair value ¥ 9,568 ¥ 190,971
Derivative financial assets, fair value 56,363  
Derivative financial assets, notional amount 1,390,341  
Derivative financial liabilities, notional amount 208,938 3,282,823
Foreign exchange swaps    
Disclosure of detailed information about financial instruments    
Derivative financial Liabilities, fair value 9,568 152,005
Derivative financial assets, fair value 19,279  
Derivative financial assets, notional amount 648,404  
Derivative financial liabilities, notional amount 208,938 2,186,865
Currency forwards    
Disclosure of detailed information about financial instruments    
Derivative financial Liabilities, fair value   38,966
Derivative financial assets, fair value 37,084  
Derivative financial assets, notional amount ¥ 741,937  
Derivative financial liabilities, notional amount   ¥ 1,095,958