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Financial Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Financial Assets [Abstract] |
Summary of Available-for-sale Financial Assets Non Current |
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Equity securities |  |  |  |  |  |  |  |
Domestic listed stocks |  | $ | 2,521 |  |  | $ | 3,125 |
Domestic non-listed stocks |  |  | 1,949 |  |  |  | 2,332 |
Foreign non-listed stocks |  |  | 294 |  |  |  | 294 |
|  | $ | 4,764 |  |  | $ | 5,751 |

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