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Income Tax - Summary of Analysis of Deferred Income Tax and Liabilities (Detail) - TWD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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Deferred Income Tax Assets [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred Tax Asset and Liabilty | $ 64,175.8 | $ 69,185.9 | $ 49,153.9 | $ 25,958.2
Deferred Income Tax Liabilities [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred Tax Asset and Liabilty |  | (1,031.4) | (1,873.9) | (1,729.9)
Depreciation [Member] | Deferred Income Tax Assets [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred Tax Asset and Liabilty | 41,094.7 | 45,299.3 | 34,720.7 | 19,354.4
Refund Liability [Member] | Deferred Income Tax Assets [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred Tax Asset and Liabilty | 9,415.0 | 12,089.5 | 5,986.2 | 3,755.1
Unrealized Exchange Losses [Member] | Deferred Income Tax Assets [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred Tax Asset and Liabilty | 7,100.0 | 5,782.4 |  |
Unrealized Loss On Inventories [Member] | Deferred Income Tax Assets [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred Tax Asset and Liabilty | 2,771.2 | 2,305.3 | 899.0 | 858.5
Net Defined Benefit Liability [Member] | Deferred Income Tax Assets [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred Tax Asset and Liabilty | 1,729.7 | 1,722.0 | 1,237.1 | 1,342.1
Deferred Compensation Cost [Member] | Deferred Income Tax Assets [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred Tax Asset and Liabilty | 489.6 | 361.2 | 374.0 | 330.3
Investment Tax Credits [Member] | Deferred Income Tax Assets [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred Tax Asset and Liabilty | 19.1 | 945.0 | 5,621.7 |
Others [member] | Deferred Income Tax Assets [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred Tax Asset and Liabilty | 1,556.5 | 681.2 | 315.2 | 317.8
Others [member] | Deferred Income Tax Liabilities [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred Tax Asset and Liabilty | $ (53.8) | $ (1,031.4) | $ (1,167.6) | $ (863.4)

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