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Pledged Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Subclassifications Of Assets Liabilities And Equities [Abstract] |
Assets Pledged as Collaterals | The following assets are pledged as collaterals for bank loans and custom duties of the imported materials.
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Property, plant and equipment |  | $ | 2,580 |  |  | $ | 2,550 |
Land held under development (included in inventories) |  |  | 1,999 |  |  |  | 1,999 |
Restricted assets (included in other assets - others) |  |  | 21 |  |  |  | 3 |
|  | $ | 4,600 |  |  | $ | 4,552 |

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