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Share-based awards- Expense by function (Details) - CNY (¥)
¥ in Millions
6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Share-based awards    
Share-based compensation expense ¥ 32,409 ¥ 15,260
Cost of revenue    
Share-based awards    
Share-based compensation expense 7,331 3,780
Product development expenses    
Share-based awards    
Share-based compensation expense 13,667 6,526
Sales and marketing expenses    
Share-based awards    
Share-based compensation expense 3,237 1,852
General and administrative expenses    
Share-based awards    
Share-based compensation expense ¥ 8,174 ¥ 3,102