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Income Tax - Summary of Analysis of Deferred Income Tax and Liabilities (Detail) - TWD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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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 | $ 65,943.3 | $ 64,175.8 | $ 69,185.9 | $ 49,153.9
Deferred Income Tax Liabilities [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred Tax Asset and Liabilty | (3,988.5) | (53.8) | (1,031.4) | (1,873.9)
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 | 33,319.8 | 41,094.7 | 45,299.3 | 34,720.7
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 | 13,274.4 | 9,415.0 | 12,089.5 | 5,986.2
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 | 9,078.2 | 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 | 2,749.3 | 2,771.2 | 2,305.3 | 899.0
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 | 1,416.0 | 1,729.7 | 1,722.0 | 1,237.1
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 | 588.8 | 489.6 | 361.2 | 374.0
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 | 2,902.4 | 1,575.6 | 1,626.2 | 5,936.9
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 | (63.2) | $ (53.8) | $ (1,031.4) | $ (1,167.6)
Operating Loss Carryforward [Member] | Deferred Income Tax Assets [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred Tax Asset and Liabilty | 2,614.4 |  |  |
Subsidiarys projected earnings distribution [Member] | Deferred Income Tax Liabilities [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred Tax Asset and Liabilty | $ (3,925.3) |  |  |

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