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Management of financial risk - Movements in the impairment loss allowance of contract assets of transaction based and support service (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Management of financial risk      
Beginning of the year ¥ (6,396,579)    
End of the year (3,161,370) ¥ (6,396,579)  
Financial assets measured at fair value through other comprehensive income (FVOCI)      
Management of financial risk      
Beginning of the year (2,226,138)    
End of the year   (2,226,138)  
Loans and advances to customers. | Financial assets measured at fair value through other comprehensive income (FVOCI)      
Management of financial risk      
Beginning of the year (12,061) (11,528) ¥ (1,962)
Reversals/(additions) of impairment loss (10,863) (13,344) (10,616)
Write-off 2,222 12,811 1,050
Disposal of subsidiaries 20,702    
End of the year   (12,061) (11,528)
Credit risk | Contract assets of transaction based and support service | Three-stage approach | Financial assets at amortized cost      
Management of financial risk      
Beginning of the year (61)   (190)
Reversals/(additions) of impairment loss   (61) ¥ 190
Recovery of amounts written off previously 15    
Disposal of subsidiaries ¥ 46    
End of the year   ¥ (61)