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Significant equity transaction, mergers and acquisitions and investments- Transactions not completed as of balance sheet date (Details) - HKD ($)
shares in Millions, $ in Billions
1 Months Ended
Apr. 30, 2020
May 31, 2020
Alibaba Health | Subsequent event    
Investment    
Equity interest held in subsidiary (as a percentage) 60.00%  
Banma    
Investment    
Equity interest (as a percent) 36.00%  
Banma | Subsequent event    
Investment    
Ownership of investee upon completion of transaction (as a percent)   50.00%
Alibaba Health | Subsequent event    
Investment    
Aggregate consideration $ 8.1  
Additional ordinary shares issued (in shares) 861