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Share-based awards- Partner Capital Investment Plan (Details)
¥ in Millions
12 Months Ended
Mar. 31, 2021
CNY (¥)
shares
Mar. 31, 2020
CNY (¥)
shares
Mar. 31, 2019
CNY (¥)
shares
Mar. 31, 2018
$ / shares
shares
Mar. 31, 2017
$ / shares
shares
Mar. 31, 2016
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2014
$ / shares
shares
Dec. 31, 2013
$ / shares
shares
Mar. 31, 2021
$ / shares
Mar. 31, 2020
$ / shares
Mar. 31, 2019
$ / shares
Share-based awards                        
Number of shares underlying available for offering 276,575,864                      
Share-based compensation expense | ¥ ¥ 50,120 ¥ 31,742 ¥ 37,491                  
Partner Capital Investment Plan | Subscription rights                        
Share-based awards                        
Number of restricted shares each right entitles the holder to purchase after the Share Subdivision 8 8 8 8 8 8 8 8 8      
Agreed-upon exercise price | $ / shares             $ 14.50 $ 14.50 $ 14.50      
Subscription period 10 years 10 years 10 years 10 years 10 years 10 years 4 years 4 years 4 years      
Restriction period for the transfer shares             8 years 8 years 8 years      
Number of shares underlying 149,957,904                      
Number of shares underlying available for offering 24,889,472                      
Unamortized compensation costs | ¥ ¥ 452                      
Weighted average period over which unamortized compensation costs expected be recognized 4 years                      
Share-based compensation expense | ¥ ¥ 224 ¥ 425 ¥ 409                  
Granted 0                      
Subscription right fair value assumptions                        
Risk-free interest rate   1.64% 2.94%                  
Expected dividend yield   0.00% 0.00%                  
Expected life (years)   8 years 3 months 8 years 3 months                  
Expected volatility   33.10% 33.00%                  
Partner Capital Investment Plan | Subscription rights | Minimum                        
Share-based awards                        
Agreed-upon exercise price | $ / shares       $ 23.00 $ 23.00 $ 23.00       $ 23.00 $ 23.00 $ 23.00
Partner Capital Investment Plan | Subscription rights | Maximum                        
Share-based awards                        
Agreed-upon exercise price | $ / shares       $ 26.00 $ 26.00 $ 26.00       $ 26.00 $ 26.00 $ 26.00