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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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