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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, 2022 | Dec. 31, 2021
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Vanguard International Semiconductor Corporation [member] |  |
Disclosure of associates [line items] |  |
Closing Price in Active Markets | $ 35,977.3 | $ 73,347.3
Global Unichip Corporation [member] |  |
Disclosure of associates [line items] |  |
Closing Price in Active Markets | 29,926.9 | 27,359.1
Xintec Inc. [member] |  |
Disclosure of associates [line items] |  |
Closing Price in Active Markets | $ 10,716.4 | $ 15,913.3

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