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Held-To-Maturity Financial Assets - Current (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Financial Assets [Abstract] |
Summary of Held-to-maturity Financial Assets Current and Related Information |
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Corporate bonds |  | $ | 1,990 |  |  | $ | — |
Bank debentures |  |  | 150 |  |  |  | — |
|  | $ | 2,140 |  |  | $ | — |
The related information of corporate bonds and bank debentures as of balance sheet dates was as follows:
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Corporate bonds |  |  |  |  |  |  |  |
Par value |  | $ | 1,990 |  |  | $ | — |
Nominal interest rate |  | 1.18%-1.35% |  |  |  | — |
Effective interest rate |  | 1.20%-1.35% |  |  |  | — |
Average remaining maturity life |  | 0.34 year |  |  |  | — |
Bank debentures |  |  |  |  |  |  |  |
Par value |  | $ | 150 |  |  | $ | — |
Nominal interest rate |  |  | 1.25 | % |  |  | — |
Effective interest rate |  |  | 1.25 | % |  |  | — |
Average remaining maturity life |  | 0.41 year |  |  |  | — |

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