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Intangible assets, net - General (Details)
¥ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2021
CNY (¥)
Mar. 31, 2020
CNY (¥)
Mar. 31, 2021
USD ($)
Intangible assets, net      
Gross carrying amount ¥ 131,217 ¥ 110,139  
Less: accumulated amortization and impairment (60,384) (49,192)  
Net book value 70,833 60,947 $ 10,811
Intangible assets acquired 20,750 5,626  
User base and customer relationships      
Intangible assets, net      
Gross carrying amount 50,066 50,016  
Trade names, trademarks and domain names      
Intangible assets, net      
Gross carrying amount 39,440 26,151  
Non-compete agreements      
Intangible assets, net      
Gross carrying amount 19,445 13,898  
Developed technology and patents      
Intangible assets, net      
Gross carrying amount 12,855 10,051  
Licenses copyrights and others      
Intangible assets, net      
Gross carrying amount ¥ 9,411 ¥ 10,023