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Investments in equity investees- Others (Details)
¥ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2019
CNY (¥)
Mar. 31, 2018
CNY (¥)
Mar. 31, 2017
CNY (¥)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
CNY (¥)
Apr. 01, 2018
CNY (¥)
Investments in equity investees            
Impairment charges of cost method investments   ¥ 1,753 ¥ 2,125      
Impairment charges relating to the equity method investments ¥ 493 18,153 245      
Equity securities accounted for using cost method   59,942 35,404      
Carrying value as equity method investment   79,758 ¥ 84,964 $ 12,584 ¥ 84,454 ¥ 79,758
ASU 2016-01 | Adjustment            
Investments in equity investees            
Equity securities accounted for using cost method   (59,942)       (59,942)
Investment securities           ¥ 59,942
Alibaba Pictures            
Investments in equity investees            
Impairment charges relating to the equity method investments   18,116        
Individually immaterial cost method investments, fair value estimated | Carrying amount            
Investments in equity investees            
Cost method investment   30,318        
Individually immaterial cost method investments, fair value estimated | Approximate fair value            
Investments in equity investees            
Cost method investment   61,936        
Individually immaterial cost method investments, not practical to estimate fair value | Carrying amount            
Investments in equity investees            
Cost method investments carrying value for which there is no fair value estimate   ¥ 29,624        
Equity method investments, publicly traded            
Investments in equity investees            
Carrying value as equity method investment         56,463  
Market values of equity method investments         ¥ 72,200