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Investment in equity investees (Details 2) - CNY (¥) ¥ in Millions | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013 | Mar. 31, 2012
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Investment in equity investees |  |  |  |
Carrying value as equity method investment | ¥ 18,204 | ¥ 4,077 | ¥ 196 | ¥ 326
Equity method investments, publicly traded |  |  |  |
Investment in equity investees |  |  |  |
Carrying value as equity method investment | 13,218 |  |  |
Open market values of equity method investments | 24,332 |  |  |
Individually immaterial cost method investments, fair value estimated | Carrying amount |  |  |  |
Investment in equity investees |  |  |  |
Cost method investment | 6,046 | 9,917 |  |
Individually immaterial cost method investments, fair value estimated | Approximate fair value |  |  |  |
Investment in equity investees |  |  |  |
Cost method investment | 14,965 | 14,455 |  |
Individually immaterial cost method investments, not practical to estimate fair value | Carrying amounts |  |  |  |
Investment in equity investees |  |  |  |
Cost method investments carrying value for which there is no fair value estimate | ¥ 9,627 | ¥ 3,672 |  |

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