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Intangible assets (Details)
$ in Millions
12 Months Ended
Mar. 31, 2015
USD ($)
Mar. 31, 2015
CNY (¥)
Mar. 31, 2014
CNY (¥)
Mar. 31, 2013
CNY (¥)
Mar. 31, 2015
CNY (¥)
Intangible assets          
Less: accumulated amortization and impairment     ¥ (1,217,000,000)   ¥ (3,543,000,000)
Net book value $ 1,061   1,906,000,000   6,575,000,000
Amortization of intangible assets $ 337 ¥ 2,089,000,000 315,000,000 ¥ 130,000,000  
Impairment charge   ¥ 0 0 ¥ 18,000,000  
Non-compete agreements          
Intangible assets          
Gross carrying amount     1,050,000,000   3,630,000,000
Developed technology and patents          
Intangible assets          
Gross carrying amount     1,041,000,000   3,331,000,000
Trade names, trademarks and domain names          
Intangible assets          
Gross carrying amount     768,000,000   2,007,000,000
User base and customer relationships          
Intangible assets          
Gross carrying amount     ¥ 264,000,000   855,000,000
Copyrights and other          
Intangible assets          
Gross carrying amount         ¥ 295,000,000