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Intangible assets - Possible changes of key assumptions (Details) - CGU Technology Solution - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Intangible assets    
Revenue growth rate decrease 5.00% 5.00%
Profit margin decrease 1.00%  
Long term growth rate decrease 1.00% 1.00%
Pre-tax discount rate increase 1.00% 1.00%
Recoverable amount of the CGU exceeding its carrying amount Recoverable amount of the CGU exceeding its carrying amount ¥ 781,499 ¥ 3,191,952
Revenue growth rate    
Intangible assets    
Recoverable amount of the CGU exceeding its carrying amount Recoverable amount of the CGU exceeding its carrying amount 373,790 1,325,839
Profit Margin    
Intangible assets    
Recoverable amount of the CGU exceeding its carrying amount Recoverable amount of the CGU exceeding its carrying amount 459,556 2,532,835
Long term growth rate.    
Intangible assets    
Recoverable amount of the CGU exceeding its carrying amount Recoverable amount of the CGU exceeding its carrying amount 669,058 2,741,710
Pre-tax discount rate    
Intangible assets    
Recoverable amount of the CGU exceeding its carrying amount Recoverable amount of the CGU exceeding its carrying amount ¥ 616,950 ¥ 2,594,933