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Bank borrowings (Details 2) ¥ in Millions, $ in Millions	Mar. 31, 2015 USD ($)	Mar. 31, 2015 CNY (¥)	Mar. 31, 2014 CNY (¥)
Long-term Debt, Fiscal Year Maturity [Abstract]
Within 1 year	$ 321	¥ 1,990	¥ 1,100
Bank borrowings
Long-term Debt, Fiscal Year Maturity [Abstract]
Within 1 year		1,990	¥ 1,100
Between 1 to 2 years		286
Between 2 to 3 years		637
Between 3 to 4 years		471
Between 4 to 5 years		215
Total		¥ 3,599

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Outstanding principal balance of short-term and long-term debt, before deduction of unamortized discount or premium.

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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