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Investments Accounted for Using Equity Method (Tables) | 12 Months Ended
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Dec. 31, 2018
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Summary of Investments in Associates | Associates consisted of the following:
|  |  |  | Place of |  | Carrying Amount |  |  | % of Ownership and Voting Rights Held by the Company |
Name of Associate |  | Principal Activities |  | Incorporation and Operation |  | December 31, 2017 |  |  | December 31, 2018 |  |  | December 31, 2017 |  |  | December 31, 2018 |
|  |  |  |  |  | NT$ |  |  | NT$ |  |  |  |  |  |  |
|  |  |  |  |  | (In Millions) |  |  | (In Millions) |  |  |  |  |  |  |
Vanguard International Semiconductor Corporation (VIS) |  | Manufacturing, selling, packaging, testing and computer-aided design of integrated circuits and other semiconductor devices and the manufacturing and design service of masks |  | Hsinchu, Taiwan |  | $ | 8,465.0 |  |  | $ | 8,924.8 |  |  |  | 28% |  |  |  | 28% |
Systems on Silicon Manufacturing Company Pte Ltd. (SSMC) |  | Manufacturing and selling of integrated circuits and other semiconductor devices |  | Singapore |  |  | 5,677.6 |  |  |  | 5,772.8 |  |  |  | 39% |  |  |  | 39% |
Xintec Inc. (Xintec) |  | Wafer level chip size packaging and wafer level post passivation interconnection service |  | Taoyuan, Taiwan |  |  | 2,292.1 |  |  |  | 1,764.6 |  |  |  | 41% |  |  |  | 41% |
Global Unichip Corporation (GUC) |  | Researching, developing, manufacturing, testing and marketing of integrated circuits |  | Hsinchu, Taiwan |  |  | 1,273.9 |  |  |  | 1,283.9 |  |  |  | 35% |  |  |  | 35% |
Mutual-Pak |  | Manufacturing of electronic parts, wholesaling and retailing of electronic materials, and researching, developing and testing of RFID |  | New Taipei, Taiwan |  |  | 23.2 |  |  |  | 22.9 |  |  |  | 39% |  |  |  | 39% |
|  |  |  |  |  | $ | 17,731.8 |  |  | $ | 17,769.0 |  |  |  |  |  |  |  |  |
Summary of Market Prices of Investments Accounted for Using Equity Method in Publicly Traded Stocks Calculated by Closing Price at End of Reporting Period |
|  | December 31, 2017 |  |  | December 31, 2018 |
|  | NT$ |  |  | NT$ |
Name of Associate |  | (In Millions) |  |  | (In Millions) |
VIS |  | $ | 30,638.8 |  |  | $ | 27,621.3 |
GUC |  | $ | 11,905.4 |  |  | $ | 9,617.7 |
Xintec |  | $ | 9,180.8 |  |  | $ | 3,783.6 |

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