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Intangible assets, net - Amortization (Details)
¥ in Millions, $ in Millions
Mar. 31, 2017
USD ($)
Mar. 31, 2017
CNY (¥)
Mar. 31, 2016
CNY (¥)
Estimated aggregate amortization expenses      
2018   ¥ 6,129  
2019   2,880  
2020   906  
2021   429  
2022   417  
Thereafter   3,347  
Net book value $ 2,050 ¥ 14,108 ¥ 5,370