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Intangible assets, net - Amortization (Details)
¥ in Millions, $ in Millions
Mar. 31, 2018
USD ($)
Mar. 31, 2018
CNY (¥)
Mar. 31, 2017
CNY (¥)
Intangible assets, net      
2019   ¥ 6,764  
2020   3,408  
2021   1,962  
2022   1,513  
2023   1,391  
Thereafter   12,427  
Net book value $ 4,378 ¥ 27,465 ¥ 14,108