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Investments Accounted for Using Equity Method (Tables) | 12 Months Ended
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Dec. 31, 2023
Text Block [Abstract] |
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, 2022 |  |  | December 31, 2023 |  |  | December 31, 2022 |  |  | December 31, 2023 |
|  |  |  |  |  |  | NT$ |  |  | NT$ |  |  |  |  |  |  |
|  |  |  |  |  |  | (In Millions) |  |  | (In Millions) |  |  |  |  |  |  |
Vanguard International Semiconductor Corporation (VIS) |  | Manufacturing, sales, packaging, testing and computer-aided design of integrated circuits and other semiconductor devices and the manufacturing and design service of masks |  |  | Hsinchu, Taiwan |  |  | $ | 13,268.2 |  |  | $ | 13,496.0 |  |  |  | 28% |  |  |  | 28% |
Systems on Silicon Manufacturing Company Pte Ltd. (SSMC) |  | Manufacturing and sales of integrated circuits and other semiconductor devices |  |  | Singapore |  |  |  | 8,934.7 |  |  |  | 9,728.8 |  |  |  | 39% |  |  |  | 39% |
Xintec Inc. (Xintec) |  | Wafer level chip size packaging and wafer level post passivation interconnection service |  |  | Taoyuan, Taiwan |  |  |  | 3,491.7 |  |  |  | 3,734.3 |  |  |  | 41% |  |  |  | 41% |
Global Unichip Corporation (GUC) |  | Researching, developing, manufacturing, testing and marketing of integrated circuits |  |  | Hsinchu, Taiwan |  |  |  | 1,608.1 |  |  |  | 2,482.9 |  |  |  | 35% |  |  |  | 35% |
Mutual-Pak Technology Co., Ltd. (Mutual-Pak) |  | Manufacturing of electronic parts, wholesaling and retailing of electronic materials, and researching, developing and testing of RFID |  |  | New Taipei, Taiwan |  |  |  | 19.0 |  |  |  | - |  |  |  | 28% |  |  |  | - |
|  |  |  |  |  |  |  | $ | 27,321.7 |  |  | $ | 29,442.0 |  |  |  |  |  |  |  |  |
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, 2022 |  | December 31, 2023
|  | NT$ |  | NT$
Name of Associate |  | (In Millions) |  | (In Millions)
GUC |  |  |  | $ | 29,926.9 |  |  |  |  |  |  | $ | 81,236.9 |  |  |
VIS |  |  |  | $ | 35,977.3 |  |  |  |  |  |  | $ | 37,834.2 |  |  |
Xintec |  |  |  | $ | 10,716.4 |  |  |  |  |  |  | $ | 14,188.4 |  |  |

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