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Investments in equity method investees - Others (Details)
¥ in Millions, $ in Millions
Sep. 30, 2020
CNY (¥)
Sep. 30, 2020
USD ($)
Mar. 31, 2020
CNY (¥)
Investments in equity investees      
Carrying value as equity method investment ¥ 209,449 $ 30,848 ¥ 189,632
Equity method investments, publicly traded      
Investments in equity investees      
Carrying value as equity method investment 64,554    
Market values of equity method investments ¥ 72,988