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Deferred revenue and customer advances (Details)
¥ in Millions, $ in Millions
Mar. 31, 2015
USD ($)
Mar. 31, 2015
CNY (¥)
Mar. 31, 2014
CNY (¥)
Deferred revenue and customer advances      
Deferred revenue   ¥ 5,781 ¥ 4,766
Customer advances   2,578 2,158
Total   8,359 6,924
Less: current portion $ (1,277) (7,914) (6,496)
Non-current portion $ 72 ¥ 445 ¥ 428