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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2018
Text block [abstract] |
Summary of Inventories |
|  | December 31, 2017 |  |  | December 31, 2018 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Finished goods |  | $ | 9,923.3 |  |  | $ | 11,329.8 |
Work in process |  |  | 53,362.2 |  |  |  | 72,071.9 |
Raw materials |  |  | 7,143.8 |  |  |  | 15,233.9 |
Supplies and spare parts |  |  | 3,451.4 |  |  |  | 4,595.4 |
|  | $ | 73,880.7 |  |  | $ | 103,231.0 |

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