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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2017
Classes Of Inventories [Abstract] |
Summary of Inventories |
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Merchandise |  | $ | 4,136 |  |  | $ | 5,133 |
Project in process |  |  | 961 |  |  |  | 1,390 |
Work in process |  |  | 109 |  |  |  | 152 |
Raw materials |  |  | 143 |  |  |  | 89 |
|  |  | 5,349 |  |  |  | 6,764 |
Land held under development |  |  | 1,999 |  |  |  | 1,999 |
Construction in progress |  |  | 75 |  |  |  | 77 |
|  | $ | 7,423 |  |  | $ | 8,840 |

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