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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Summary of Inventories |
|  | December 31, 2016 |  |  | December 31, 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Finished goods |  | $ | 8,521.9 |  |  | $ | 9,923.3 |
Work in process |  |  | 33,330.8 |  |  |  | 53,362.2 |
Raw materials |  |  | 4,012.2 |  |  |  | 7,143.8 |
Supplies and spare parts |  |  | 2,817.3 |  |  |  | 3,451.4 |
|  | $ | 48,682.2 |  |  | $ | 73,880.7 |

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