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Investment Properties (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Investment Property [Abstract] |
Summary of Investment Properties |
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Carrying amount |  |  |  |  |  |  |  |
Investment properties |  | $ | 8,115 |  |  | $ | 8,048 |
|  |  |  | Investment Properties |
|  |  |  | NT$ |
|  |  |  | (In Millions) |
Cost |  |  |  |  |  |
Balance on January 1, 2015 |  |  |  | $ | 8,883 |
Disposal |  |  |  |  | — |
Reclassification |  |  |  |  | 175 |
Balance on December 31, 2015 |  |  |  | $ | 9,058 |
Accumulated depreciation and impairment |  |  |  |  |  |
Balance on January 1, 2015 |  |  |  | $ | (1,262 | )
Depreciation expense |  |  |  |  | (18 | )
Disposal |  |  |  |  | — |
Reclassification |  |  |  |  | (18 | )
Reversal of impairment loss |  |  |  |  | 142 |
Balance on December 31, 2015 |  |  |  | $ | (1,156 | )
Cost |  |  |  |  |  |
Balance on January 1, 2016 |  |  |  | $ | 9,058 |
Additions |  |  |  |  | — |
Reclassification |  |  |  |  | 137 |
Balance on December 31, 2016 |  |  |  | $ | 9,195 |
Accumulated depreciation and impairment |  |  |  |  |  |
Balance on January 1, 2016 |  |  |  | $ | (1,156 | )
Depreciation expense |  |  |  |  | (19 | )
Reclassification |  |  |  |  | (53 | )
Reversal of impairment loss |  |  |  |  | 148 |
Balance on December 31, 2016 |  |  |  | $ | (1,080 | )
Cost |  |  |  |  |  |
Balance on January 1, 2017 |  |  |  | $ | 9,195 |
Reclassification |  |  |  |  | (60 | )
Balance on December 31, 2017 |  |  |  | $ | 9,135 |
Accumulated depreciation and impairment |  |  |  |  |  |
Balance on January 1, 2017 |  |  |  | $ | (1,080 | )
Depreciation expense |  |  |  |  | (21 | )
Reclassification |  |  |  |  | 3 |
Reversal of impairment loss |  |  |  |  | 11 |
Balance on December 31, 2017 |  |  |  | $ | (1,087 | )
Estimated Service Lives of Investment Properties | Depreciation expense is computed using the straight-line method over the following estimated service lives:
Land improvements |  | 8-30 years
Buildings |  |
Main buildings |  | 35-60 years
Other building facilities |  | 4-10 years
Key Assumptions and Fair Values of Investment Properties | The fair values of the Company’s investment properties as of December 31, 2016 and 2017 were determined by Level 3 fair value measurements inputs based on the appraisal reports conducted by independent appraisers. Those appraisal reports are based on the comparison approach, income approach or cost approach. Key assumptions and the fair values were as follows:
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Fair value |  | $ | 17,778 |  |  | $ | 17,728 |
Overall capital interest rate |  | 1.46%-2.20% |  |  | 1.46%-2.20% |
Profit margin ratio |  | 10%-20% |  |  | 12%-20% |
Discount rate |  |  | 1.04 | % |  | 1.04% |
Capitalization rate |  | 0.43%-1.78% |  |  | 0.47%-1.69% |

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