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v3.23.1

Income Tax - Summary of Analysis of Deferred Income Tax and Liabilities (Detail) - TWD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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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 | $ 69,185.9 | $ 49,153.9 | $ 25,958.2 | $ 17,928.4
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) | (344.4)
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 | 45,299.3 | 34,720.7 | 19,354.4 | 13,547.2
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 | 12,089.5 | 5,986.2 | 3,755.1 | 2,150.4
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 | 5,782.4 | 0.0 |  |
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 | 2,305.3 | 899.0 | 858.5 | 469.4
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 | 1,722.0 | 1,237.1 | 1,342.1 | 1,016.3
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 | 945.0 | 5,621.7 |  |
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 | 361.2 | 374.0 | 330.3 | 323.1
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 | 681.2 | 315.2 | 317.8 | 422.0
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 | (1,031.4) | (1,167.6) | (863.4) | (10.8)
Unrealized Exchange Gains [Member] | Deferred Income Tax Liabilities [Member] |  |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |  |  |
Deferred Tax Asset and Liabilty | $ 0.0 | $ (706.3) | $ (866.5) | $ (333.6)

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