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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, 2018 | Dec. 31, 2017
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Vanguard International Semiconductor Corporation [member] |  |
Disclosure of associates [line items] |  |
Closing Price in Active Markets | $ 27,621.3 | $ 30,638.8
Global Unichip Corporation [member] |  |
Disclosure of associates [line items] |  |
Closing Price in Active Markets | 9,617.7 | 11,905.4
Xintec Inc. [member] |  |
Disclosure of associates [line items] |  |
Closing Price in Active Markets | $ 3,783.6 | $ 9,180.8

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