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Significant equity transactions, mergers and acquisitions and investments - STO Express (Details) - STO Express - CNY (¥)
¥ in Millions
1 Months Ended 6 Months Ended
Sep. 30, 2020
Jul. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Investment        
Equity interest (as a percent)   14.70%    
Cash consideration   ¥ 4,700    
Unrealized gains (losses) relating to this call option agreement     ¥ (485) ¥ 247
Call Option One        
Investment        
Cash consideration ¥ 3,300      
Percentage of equity interest the Company may elect to acquire 21.00% 31.30%    
Total consideration ¥ 6,700 ¥ 10,000    
Ownership of investee upon completion of transaction (as a percent) 25.00%   25.00%