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Intangible assets, net - General (Details)
¥ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2020
CNY (¥)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
CNY (¥)
Intangible assets      
Gross carrying amount ¥ 110,139   ¥ 103,126
Less: accumulated amortization and impairment (49,192)   (34,850)
Net book value 60,947 $ 8,607 68,276
Intangible assets acquired 5,626    
User base and customer relationships      
Intangible assets      
Gross carrying amount 50,016   47,913
Trade names, trademarks and domain names      
Intangible assets      
Gross carrying amount 26,151   22,592
Non-compete agreement      
Intangible assets      
Gross carrying amount 13,898   12,528
Developed technology and patents      
Intangible assets      
Gross carrying amount 10,051   9,510
Licensed copyrights      
Intangible assets      
Gross carrying amount 9,639   9,225
Others      
Intangible assets      
Gross carrying amount ¥ 384   ¥ 1,358