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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, 2018 TWD ($) | Dec. 31, 2017 TWD ($) | Dec. 31, 2018 USD ($)
Disclosure of associates [line items] |  |  |
Carrying Amount | $ 17,769.0 | $ 17,731.8 | $ 580.5
Vanguard International Semiconductor Corporation [member] |  |  |
Disclosure of associates [line items] |  |  |
Principal Activities | Manufacturing, selling, 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 |  |
Carrying Amount | $ 8,924.8 | $ 8,465.0 |
% 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 selling of integrated circuits and other semiconductor devices |  |
Place of Incorporation and Operation | Singapore |  |
Carrying Amount | $ 5,772.8 | $ 5,677.6 |
% 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 |  |
Place of Incorporation and Operation | Taoyuan, Taiwan |  |
Carrying Amount | $ 1,764.6 | $ 2,292.1 |
% 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 |  |
Place of Incorporation and Operation | Hsinchu, Taiwan |  |
Carrying Amount | $ 1,283.9 | $ 1,273.9 |
% of Ownership and Voting Rights Held by the Company | 35.00% | 35.00% |
Mutual-Pak Technology Co., Ltd [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 |  |
Place of Incorporation and Operation | New Taipei, Taiwan |  |
Carrying Amount | $ 22.9 | $ 23.2 |
% of Ownership and Voting Rights Held by the Company | 39.00% | 39.00% |

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