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Finance Costs - Summary of Finance Costs (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Interest expense, Corporate bonds | $ 19,278.1 |  | $ 17,848.9 | $ 14,116.1
Lease liabilities | 373.4 |  | 382.0 | 267.1
Interest expense, Bank loans | 150.8 |  | 95.4 | 32.0
Interest expense, Others | 3.4 |  | 2.8 | 1.7
Less: Capitalized interest under property, plant and equipment | (9,310.3) |  | (6,329.7) | (2,666.9)
Finance costs | $ 10,495.4 | $ 320.1 | $ 11,999.4 | $ 11,750.0
Bottom of range [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Capitalisation rate | 1.20% | 1.20% | 1.08% |
Top of range [member] |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Capitalisation rate | 3.34% | 3.34% | 3.36% |

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- Definition The weighted average of interest and other costs that an entity incurs in connection with the borrowing of funds applicable to the borrowings of the entity that are outstanding during the period, other than borrowings made specifically for the purpose of obtaining a qualifying asset. [Refer: Weighted average [member]; Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 23 -IssueDate 2024-01-01 -Paragraph 26 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=23&code=ifrs-tx-2024-en-r&anchor=para_26_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of costs associated with financing activities of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 82 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_82_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of interest costs that an entity incurs in connection with the borrowing of funds that are directly attributable to the acquisition, construction or production of a qualifying asset and which form part of the cost of that asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of interest expense on bonds issued. [Refer: Interest expense; Bonds issued] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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