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Taxation - Income taxes (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
HKD ($)
Dec. 31, 2023
HKD ($)
Dec. 31, 2022
HKD ($)
Dec. 31, 2024
CNY (¥)
Income taxes        
Income tax rate (as a percent) 25.00% 25.00% 25.00%  
Reconciliation of the differences between the statutory income tax rate and the Group's effective income tax rate        
Statutory income tax rate 25.00% 25.00% 25.00%  
Permanent differences 5.30% (1.33%) 6.74%  
Tax rate difference from statutory rate in other jurisdictions [1] (7.80%) (2.96%) (3.19%)  
Tax effect of preferential tax treatments (9.49%) (4.73%) (8.91%)  
Withholding tax (1.29%) (0.47%) (0.25%)  
Change in valuation allowance (9.11%) (17.17%) (20.79%)  
Effective income tax rate 2.61% (1.66%) (1.40%)  
Operating loss carryforwards        
Net operating tax loss carry forwards       ¥ 20,882,606,000
Loss expiring in 2025        
Operating loss carryforwards        
Net operating tax loss carry forwards       138,823,000
Loss expiring in 2026        
Operating loss carryforwards        
Net operating tax loss carry forwards       482,108,000
Loss expiring in 2027        
Operating loss carryforwards        
Net operating tax loss carry forwards       878,056,000
Loss expiring in 2028        
Operating loss carryforwards        
Net operating tax loss carry forwards       896,797,000
Loss expiring in 2029 and thereafter        
Operating loss carryforwards        
Net operating tax loss carry forwards       18,486,822,000
Cayman Islands        
Income taxes        
Withholding tax amount       ¥ 0
Hong Kong, China        
Income taxes        
Statutory income tax rate below threshold amount 8.25% 8.25% 8.25%  
Ceiling limit of profit to estimate tax rate | $ $ 2 $ 2 $ 2  
Income tax rate (as a percent) 16.50% 16.50% 16.50%  
Reconciliation of the differences between the statutory income tax rate and the Group's effective income tax rate        
Statutory income tax rate 16.50% 16.50% 16.50%  
Mainland, China        
Income taxes        
Income tax rate (as a percent) 25.00%      
Reconciliation of the differences between the statutory income tax rate and the Group's effective income tax rate        
Statutory income tax rate 25.00%      
Mainland, China | Certain subsidiaries | Encouraged Enterprises [Member]        
Income taxes        
Preferential income tax rate 15.00%      
[1] It is primarily due to the tax effect of the Company as a tax-exempt entity incorporated in Hong Kong and the Cayman Islands.