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Goodwill (Details) ¥ in Millions, $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2015 USD ($) | Mar. 31, 2015 CNY (¥) | Mar. 31, 2014 CNY (¥) | Mar. 31, 2013 CNY (¥)
Changes in goodwill |  |  |  |
Goodwill at the beginning of period |  | ¥ 11,793 | ¥ 11,294 | ¥ 11,436
Additions |  | 30,319 | 543 | 152
Deconsolidation of a subsidiary |  | (4) |  | (137)
Impairment |  | (175) | (44) | (157)
Goodwill at the end of period | $ 6,764 | 41,933 | 11,793 | ¥ 11,294
Goodwill, Impaired, Accumulated Impairment Loss |  |  |  |
Gross goodwill |  | 44,928 | 14,613 |
Accumulated impairment losses of goodwill |  | ¥ 2,995 | ¥ 2,820 |

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