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Management of financial risk - Impairment loss allowance of contract assets of transaction based and support service (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of nature and extent of risks arising from financial instruments      
Gross carrying amount ¥ 122,628 ¥ 228,763  
Loss allowance ¥ 59,852 82,340  
Gross carrying amount | Three-stage approach      
Disclosure of nature and extent of risks arising from financial instruments      
Gross carrying amount   311,103  
Impairment loss allowance | Three-stage approach      
Disclosure of nature and extent of risks arising from financial instruments      
Gross carrying amount   82,340  
Loss allowance   125,318  
Credit risk | Contract assets of transaction based and support service | Three-stage approach      
Disclosure of nature and extent of risks arising from financial instruments      
Loss allowance   ¥ 190 ¥ 711