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Income tax expenses- General (Details)
¥ in Millions, $ in Millions
12 Months Ended 36 Months Ended
Mar. 31, 2020
CNY (¥)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
CNY (¥)
Mar. 31, 2018
CNY (¥)
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2012
Mar. 31, 2018
Composition of income tax expenses                
Current income tax expense ¥ 24,005   ¥ 18,750 ¥ 17,223        
Deferred taxation (3,443) $ (486) (2,197) 976        
Income tax expenses ¥ 20,562 $ 2,904 ¥ 16,553 ¥ 18,199        
Enterprise income tax rate (as a percent) 25.00% 25.00% 25.00% 25.00%        
Total tax adjustments ¥ 4,144   ¥ 4,656 ¥ 2,295        
Undistributed earnings intended to be invested indefinitely in the PRC ¥ 107,200   ¥ 49,700          
Cayman Islands                
Composition of income tax expenses                
Withholding tax to be imposed upon payments of dividends to shareholders (as a percent) 0.00% 0.00%            
Hong Kong                
Composition of income tax expenses                
Enterprise income tax rate (as a percent) 16.50% 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% 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                
Enterprise income tax rate (as a percent)       15.00% 15.00% 15.00%    
Alibaba China | PRC | Key Software Enterprise                
Composition of income tax expenses                
Preferential tax rate (as a percent)               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% 15.00%    
Taobao China | PRC | Key Software Enterprise                
Composition of income tax expenses                
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                
Enterprise income tax rate (as a percent)     15.00%          
Preferential tax rate (as a percent)           12.50%    
Tmall China | PRC | Software Enterprise                
Composition of income tax expenses                
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  
Tmall China | PRC | Key Software Enterprise                
Composition of income tax expenses                
Enterprise income tax rate (as a percent)       15.00% 15.00% 12.50%    
Preferential tax rate (as a percent)       10.00% 10.00% 10.00%