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Financial Assets at Fair Value through Other Comprehensive Income Noncurrent (Tables) | 12 Months Ended
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Dec. 31, 2018
Noncurrent Financial Assets At Fair Value Through Other Comprehensive Income [Abstract] |
Summary of Financial Assets at Fair Value through Other Comprehensive Income Noncurrent |
|  | December 31 |
|  | 2018 |
|  | NT$ |
|  | (In Millions) |
Domestic investments |  |  |  |
Listed stocks |  | $ | 2,900 |
Non-listed stocks |  |  | 3,901 |
Foreign investments |  |  |  |
Non-listed stocks |  |  | 132 |
|  | $ | 6,933 |

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