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Share-based awards- Share options (Details) - Options
¥ in Millions
6 Months Ended 12 Months Ended
Sep. 30, 2020
CNY (¥)
$ / shares
shares
Mar. 31, 2020
$ / shares
shares
Sep. 30, 2020
$ / shares
Number of share options      
Outstanding at beginning of year 6,393,303    
Exercised (296,177)    
Outstanding at end of year 6,097,126 6,393,303  
Vested and exercisable 4,578,891    
Vested and expected to vest 5,924,098    
Weighted average exercise price      
Outstanding at beginning of year | $ / shares $ 87.81    
Exercised | $ / shares 69.15    
Outstanding at end of year | $ / shares $ 88.72 $ 87.81  
Vested and exercisable | $ / shares     $ 72.49
Vested and expected to vest | $ / shares     $ 85.98
Weighted average remaining contractual life      
Weighted average remaining contractual life, outstanding 3 years 1 month 6 days 3 years 4 months 24 days  
Weighted average remaining contractual life, vested and exercisable 2 years 4 months 24 days    
Weighted average remaining contractual life, vested and expected to vest 2 years 10 months 24 days    
Fair value assumptions      
Unamortized compensation costs | ¥ $ 201    
Weighted average period over which unamortized compensation costs expected be recognized 2 years 10 months 24 days    
Non-employees      
Number of share options      
Outstanding at end of year 25,050