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Intangible assets (Details 2)
¥ in Millions, $ in Millions
Mar. 31, 2015
USD ($)
Mar. 31, 2015
CNY (¥)
Mar. 31, 2014
CNY (¥)
Estimated aggregate amortization expenses      
2016   ¥ 2,629  
2017   2,333  
2018   1,186  
2019   342  
2020   71  
Thereafter   14  
Net book value $ 1,061 ¥ 6,575 ¥ 1,906