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Cash flow information - Gross debt (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash flow information        
Restricted cash and time deposits over three months ¥ 51,940 ¥ 447,564    
Cash and cash equivalents 1,947,922 1,379,473 ¥ 1,907,776 ¥ 1,399,370
Financial assets at fair value through profit or loss 455,016 925,204    
Lease liabilities (Note 19) (24,405) (51,224)    
-due within one year (13,735) (22,941)    
-due after one year (10,670) (28,283)    
Borrowings - repayable within one year (19,160) (251,732)    
Net debt 2,411,313 2,449,285 ¥ 2,561,572 ¥ 3,561,300
Cash and liquid investments 2,454,878 2,752,241    
Gross debt - fixed interest rates ¥ (43,565) ¥ (302,956)