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Income tax expenses- General (Details)
¥ in Millions, $ in Millions
12 Months Ended 36 Months Ended
Mar. 31, 2021
CNY (¥)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
CNY (¥)
Mar. 31, 2019
CNY (¥)
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2021
CNY (¥)
Composition of income tax expenses              
Current income tax expense ¥ 26,042   ¥ 24,005 ¥ 18,750      
Deferred taxation 3,236 $ 494 (3,443) (2,197)      
Income tax expenses ¥ 29,278 $ 4,469 ¥ 20,562 ¥ 16,553      
Enterprise income tax rate (as a percent) 25.00% 25.00% 25.00% 25.00%      
Total tax adjustments ¥ 6,085   ¥ 4,144 ¥ 4,656      
Undistributed earnings intended to be invested indefinitely in the PRC ¥ 195,300   ¥ 107,200       ¥ 195,300
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%
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 (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% 15.00%  
Alibaba China | PRC | Key Software Enterprise              
Composition of income tax expenses              
Preferential tax rate (as a percent)       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% 15.00% 15.00%  
Taobao China | PRC | 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% 15.00% 15.00% 15.00%  
Tmall China | PRC | Key Software Enterprise              
Composition of income tax expenses              
Preferential tax rate (as a percent)       10.00% 10.00% 10.00%  
Alibaba Beijing | PRC | Software Enterprise              
Composition of income tax expenses              
Enterprise income tax rate (as a percent)     12.50% 12.50%      
Period of full exemption from income tax           2 years  
Reduction in preferential tax rate (as a percent)     50.00% 50.00%      
Period of 50% reduction to income tax rate       3 years      
Alibaba Beijing | PRC | Key Software Enterprise              
Composition of income tax expenses              
Enterprise income tax rate (as a percent)       12.50%      
Preferential tax rate (as a percent)       10.00%