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Intangible assets - Key assumptions used to calculate value of goodwill (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Intangible assets    
Long term growth rate 2.00% 2.00%
Pre-tax discount rate 17.50% 16.30%
CGU Technology Solution    
Intangible assets    
Recoverable amount of the CGU exceeding its carrying amount ¥ 781,499 ¥ 3,191,952
Minimum    
Intangible assets    
Revenue growth rate (15.00%) 10.00%
Profit Margin 10.00% 15.00%
Maximum    
Intangible assets    
Revenue growth rate 13.00% 24.00%
Profit Margin 15.00% 24.00%