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Cash flow information - Gross debt reconciliation (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Net debt reconciliation      
Net debt at the beginning of the year ¥ 3,561,300 ¥ 4,406,038 ¥ 2,800,876
Cash flows (1,147,187) (675,111) 1,991,903
Acquisition of right-of-use assets (76,534) (118,030) (38,646)
Other Changes 223,993 (51,597) (348,095)
Net debt at the end of the year 2,561,572 3,561,300 4,406,038
Acquisition of subsidiaries (Note 35)     (38,646)
Lease liabilities      
Net debt reconciliation      
Net debt at the beginning of the year (154,890) (134,219) (189,689)
Cash flows 76,734 96,139 100,997
Acquisition of right-of-use assets (76,534) (118,030)  
Other Changes 63,107 1,220 (6,881)
Net debt at the end of the year (91,583) (154,890) (134,219)
Acquisition of subsidiaries (Note 35)     (38,646)
Borrowings      
Net debt reconciliation      
Net debt at the beginning of the year (815,260) (2,283,307) (3,218,566)
Cash flows 543,501 1,524,899 1,062,844
Other Changes (17,303) (56,852) (127,585)
Net debt at the end of the year (289,062) (815,260) (2,283,307)
Restricted cash      
Net debt reconciliation      
Net debt at the beginning of the year 1,060,427 2,280,499 3,440,289
Cash flows (788,828) (1,206,607) (1,064,813)
Other Changes 72,215 (13,465) (94,977)
Net debt at the end of the year 343,814 1,060,427 2,280,499
Cash and cash equivalents      
Net debt reconciliation      
Net debt at the beginning of the year 1,399,370 3,055,194 1,077,875
Cash flows 433,119 (1,627,680) 2,145,418
Other Changes 75,287 (28,144) (168,099)
Net debt at the end of the year 1,907,776 1,399,370 3,055,194
Financial assets at fair value through profit or loss      
Net debt reconciliation      
Net debt at the beginning of the year 2,071,653 1,487,871 1,690,967
Cash flows (1,411,713) 538,138 (252,543)
Other Changes 30,687 45,644 49,447
Net debt at the end of the year ¥ 690,627 ¥ 2,071,653 ¥ 1,487,871