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Intangible assets - Possible changes of key assumptions (Details) - CGU Technology Solution - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Revenue growth rate    
Intangible assets    
Decrease In Designated Risk Component ¥ (265,224) ¥ 597,067
Percentage of reasonably possible decrease in risk assumption 5.00% 5.00%
Profit Margin    
Intangible assets    
Decrease In Designated Risk Component ¥ (296,597) ¥ 886,786
Percentage of reasonably possible decrease in risk assumption 1.00% 1.00%
Long term growth rate.    
Intangible assets    
Decrease In Designated Risk Component ¥ (207,564) ¥ 1,039,101
Percentage of reasonably possible decrease in risk assumption 1.00% 1.00%
Pre-tax discount rate    
Intangible assets    
Increase In Designated Risk Component ¥ (230,342) ¥ 989,962
Percentage of reasonably possible increase in risk assumption 1.00% 1.00%