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Intangible assets- Amortization (Details)
¥ in Millions, $ in Millions
Mar. 31, 2016
USD ($)
Mar. 31, 2016
CNY (¥)
Mar. 31, 2015
CNY (¥)
Estimated aggregate amortization expenses      
2017   ¥ 3,103  
2018   1,734  
2019   449  
2020   71  
2021   8  
Thereafter   5  
Net book value $ 833 ¥ 5,370 ¥ 6,575