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Intangible assets, net - General (Details)
¥ in Millions, $ in Millions
6 Months Ended
Sep. 30, 2020
CNY (¥)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
CNY (¥)
Sep. 30, 2020
USD ($)
Mar. 31, 2020
CNY (¥)
Intangible assets          
Gross carrying amount ¥ 110,009       ¥ 110,139
Less: accumulated amortization and impairment (53,631)       (49,192)
Net book value 56,378     $ 8,304 60,947
Amortization expenses 9,726 $ 1,432 ¥ 10,813    
User base and customer relationships          
Intangible assets          
Gross carrying amount 49,943       50,016
Trade names, trademarks and domain names          
Intangible assets          
Gross carrying amount 27,771       26,151
Non-compete agreements          
Intangible assets          
Gross carrying amount 13,779       13,898
Developed technology and patents          
Intangible assets          
Gross carrying amount 10,028       10,051
Licensed copyrights          
Intangible assets          
Gross carrying amount 8,278       9,639
Licensed copyrights | Cost of revenue | Digital media and entertainment          
Intangible assets          
Amortization expenses 3,886   ¥ 4,741    
Others          
Intangible assets          
Gross carrying amount ¥ 210       ¥ 384