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Intangible assets, net - General (Details)
¥ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2017
CNY (¥)
Mar. 31, 2016
CNY (¥)
Mar. 31, 2015
CNY (¥)
Mar. 31, 2017
CNY (¥)
Intangible assets, net          
Less: accumulated amortization and impairment     ¥ (6,809)   ¥ (14,988)
Net book value $ 2,050   5,370   14,108
Amortization expenses recognized $ 1,309 ¥ 9,008 3,278 ¥ 2,173  
Non-compete agreements          
Intangible assets, net          
Gross carrying amount     4,284   5,915
Developed technology and patents          
Intangible assets, net          
Gross carrying amount     3,652   4,793
Trade names, trademarks and domain names          
Intangible assets, net          
Gross carrying amount     2,222   8,100
User base and customer relationships          
Intangible assets, net          
Gross carrying amount     1,234   4,169
Licensed copyrights of video content          
Intangible assets, net          
Gross carrying amount     ¥ 787   6,087
Others          
Intangible assets, net          
Gross carrying amount         ¥ 32