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Cash flow information - Gross debt (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Cash flow information        
Restricted cash and time deposits over three months ¥ 343,814 ¥ 1,060,427    
Cash and cash equivalents 1,907,776 1,399,370 ¥ 3,055,194 ¥ 1,077,875
Financial assets at fair value through profit or loss 690,627 2,071,653    
Lease liabilities (91,583) (154,890)    
-due within one year (47,030) (57,417)    
-due after one year (44,553) (97,473)    
Borrowings - repayable within one year (289,062) (815,260)    
Net debt 2,561,572 3,561,300 ¥ 4,406,038 ¥ 2,800,876
Cash and liquid investments 2,942,217 4,531,450    
Gross debt - fixed interest rates ¥ (380,645) ¥ (970,150)