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Investments Accounted for Using Equity Method - Market Prices of Investments Accounted for Using Equity Method in Publicly Traded Stocks Calculated by Closing Price at End of Reporting Period (Detail) - Level 1 [member] - TWD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Vanguard International Semiconductor Corporation [member] |  |
Disclosure of associates [line items] |  |
Closing Price in Active Markets | $ 53,849.9 | $ 36,812.9
Xintec Inc. [member] |  |
Disclosure of associates [line items] |  |
Closing Price in Active Markets | 20,420.2 | 8,958.2
Global Unichip Corporation [member] |  |
Disclosure of associates [line items] |  |
Closing Price in Active Markets | $ 15,827.2 | $ 11,251.8

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