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Other Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Miscellaneous Assets [Abstract] |
Summary of Other Assets |
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Spare parts |  | $ | 1,776 |  |  | $ | 2,059 |
Refundable deposits |  |  | 2,083 |  |  |  | 1,860 |
Other financial assets |  |  | 1,000 |  |  |  | 1,000 |
Others |  |  | 2,288 |  |  |  | 2,800 |
|  | $ | 7,147 |  |  | $ | 7,719 |
Current |  |  |  |  |  |  |  |
Spare parts |  | $ | 1,776 |  |  | $ | 2,059 |
Others |  |  | 346 |  |  |  | 124 |
|  | $ | 2,122 |  |  | $ | 2,183 |
Noncurrent |  |  |  |  |  |  |  |
Refundable deposits |  | $ | 2,083 |  |  | $ | 1,860 |
Other financial assets |  |  | 1,000 |  |  |  | 1,000 |
Others |  |  | 1,942 |  |  |  | 2,676 |
|  | $ | 5,025 |  |  | $ | 5,536 |

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