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Investments Accounted for Using Equity Method - Summary of Investments in Associates (Detail) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 TWD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2024 USD ($)
Disclosure of associates [line items] |  |  |
Carrying Amount | $ 37,247.8 | $ 29,442.0 | $ 1,135.9
Vanguard International Semiconductor Corporation [member] |  |  |
Disclosure of associates [line items] |  |  |
Principal Activities | Manufacturing, sales, packaging, testing and computer-aided design of integrated circuits and other semiconductor devices and the manufacturing and design service of masks | Manufacturing, sales, packaging, testing and computer-aided design of integrated circuits and other semiconductor devices and the manufacturing and design service of masks |
Place of Incorporation and Operation | Hsinchu, Taiwan | Hsinchu, Taiwan |
Carrying Amount | $ 18,212.9 | $ 13,496.0 |
% of Ownership and Voting Rights Held by the Company | 28.00% | 28.00% |
Systems on Silicon Manufacturing Company Pte Ltd. [member] |  |  |
Disclosure of associates [line items] |  |  |
Principal Activities | Manufacturing and sales of integrated circuits and other semiconductor devices | Manufacturing and sales of integrated circuits and other semiconductor devices |
Place of Incorporation and Operation | Singapore | Singapore |
Carrying Amount | $ 11,387.2 | $ 9,728.8 |
% of Ownership and Voting Rights Held by the Company | 39.00% | 39.00% |
Xintec Inc. [member] |  |  |
Disclosure of associates [line items] |  |  |
Principal Activities | Wafer level chip size packaging and wafer level post passivation interconnection service | Wafer level chip size packaging and wafer level post passivation interconnection service |
Place of Incorporation and Operation | Taoyuan, Taiwan | Taoyuan, Taiwan |
Carrying Amount | $ 4,189.6 | $ 3,734.3 |
% of Ownership and Voting Rights Held by the Company | 41.00% | 41.00% |
Global Unichip Corporation [member] |  |  |
Disclosure of associates [line items] |  |  |
Principal Activities | Researching, developing, manufacturing, testing and marketing of integrated circuits | Researching, developing, manufacturing, testing and marketing of integrated circuits |
Place of Incorporation and Operation | Hsinchu, Taiwan | Hsinchu, Taiwan |
Carrying Amount | $ 3,458.1 | $ 2,482.9 |
% of Ownership and Voting Rights Held by the Company | 35.00% | 35.00% |

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