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Intangible assets, net - Amortization (Details)
¥ in Millions, $ in Millions
Mar. 31, 2019
USD ($)
Mar. 31, 2019
CNY (¥)
Mar. 31, 2018
CNY (¥)
Intangible assets, net      
2020   ¥ 14,418  
2021   11,362  
2022   8,779  
2023   7,793  
2024   7,378  
Thereafter   18,546  
Net book value $ 10,173 ¥ 68,276 ¥ 27,465