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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, 2021 TWD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2021 USD ($)
Disclosure of associates [line items] |  |  |
Carrying Amount | $ 21,762.2 | $ 18,730.2 | $ 784.5
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 | $ 10,469.2 | $ 8,964.1 |
% 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 | $ 6,795.7 | $ 5,900.2 |
% 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 | $ 3,012.3 | $ 2,522.3 |
% 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 | $ 1,462.1 | $ 1,315.4 |
% of Ownership and Voting Rights Held by the Company | 35.00% | 35.00% |
Mutual-Pak [member] |  |  |
Disclosure of associates [line items] |  |  |
Principal Activities | Manufacturing of electronic parts, wholesaling and retailing of electronic materials, and researching, developing and testing of RFID | Manufacturing of electronic parts, wholesaling and retailing of electronic materials, and researching, developing and testing of RFID |
Place of Incorporation and Operation | New Taipei, Taiwan | New Taipei, Taiwan |
Carrying Amount | $ 22.9 | $ 28.2 |
% of Ownership and Voting Rights Held by the Company | 28.00% | 28.00% |

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