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Income tax expenses (Details)
¥ in Millions, $ in Millions
6 Months Ended 12 Months Ended
Sep. 30, 2020
CNY (¥)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
CNY (¥)
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Composition of income tax expenses            
Current income tax expense ¥ 9,010   ¥ 10,437      
Deferred taxation 4,025 $ 593 (910)      
Income tax expenses 13,035 $ 1,920 9,527      
Total tax adjustments 6,085   ¥ 4,144      
Undistributed earnings intended to be invested indefinitely in the PRC ¥ 131,700          
KY            
Composition of income tax expenses            
Withholding tax to be imposed upon payments of dividends to shareholders (as a percent) 0.00% 0.00%        
HK            
Composition of income tax expenses            
Enterprise income tax rate (as a percent) 16.50% 16.50% 16.50%      
PRC            
Composition of income tax expenses            
Enterprise income tax rate (as a percent) 25.00% 25.00% 25.00%      
Withholding income tax rate on dividends declared by PRC companies to their foreign investors (as a percent) 10.00% 10.00%        
Lower withholding income tax rate on dividends declared by PRC companies to foreign investors with certain criteria met (as a percent) 5.00% 5.00%        
Minimum percentage of ownership interests held by investors in Hong Kong to qualify for lower withholding tax rate (as a percent) 25.00% 25.00%        
PRC | High and New Technology Enterprises            
Composition of income tax expenses            
Preferential tax rate (as a percent) 15.00% 15.00%        
PRC | Software Enterprise            
Composition of income tax expenses            
Period of full exemption from income tax 2 years 2 years        
Reduction in preferential tax rate during subsequent three years (as a percent) 50.00% 50.00%        
Period of 50% reduction to income tax rate 3 years 3 years        
PRC | Key Software Enterprise            
Composition of income tax expenses            
Preferential tax rate (as a percent) 10.00% 10.00%        
Alibaba China | PRC | High and New Technology Enterprises            
Composition of income tax expenses            
Preferential tax rate (as a percent)       15.00% 15.00%  
Percentage of reduction in tax rate 10.00% 10.00%   10.00%    
Taobao China | PRC | High and New Technology Enterprises            
Composition of income tax expenses            
Enterprise income tax rate (as a percent)       15.00% 15.00%  
Preferential tax rate (as a percent) 10.00% 10.00%   10.00%    
Tmall China | PRC | High and New Technology Enterprises            
Composition of income tax expenses            
Preferential tax rate (as a percent)       15.00% 15.00%  
Percentage of reduction in tax rate 10.00% 10.00% 10.00%      
Alibaba Beijing | PRC | Software Enterprise            
Composition of income tax expenses            
Preferential tax rate (as a percent)       12.50%    
Period of full exemption from income tax           2 years
Reduction in preferential tax rate during subsequent three years (as a percent)           50.00%
Period of 50% reduction to income tax rate           3 years
Alibaba Beijing | PRC | Key Software Enterprise            
Composition of income tax expenses            
Preferential tax rate (as a percent)       12.50%    
Percentage of reduction in tax rate 10.00% 10.00%