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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) $ in Millions, $ in Millions | Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
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Disclosure Of The Ownership Details Of PropertyPlant And Equipment [Line Items] |  |  |  |
Property, plant and equipment | $ 1,975,118.7 | $ 71,201.1 | $ 1,555,589.1 | $ 1,352,377.4
Asset used by the Company [member] |  |  |  |
Disclosure Of The Ownership Details Of PropertyPlant And Equipment [Line Items] |  |  |  |
Property, plant and equipment | 1,975,114.0 |  | 1,554,585.9 | 1,352,313.9
Asset subject to operating lease [member] |  |  |  |
Disclosure Of The Ownership Details Of PropertyPlant And Equipment [Line Items] |  |  |  |
Property, plant and equipment | $ 4.7 |  | $ 1,003.2 | $ 63.5

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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2021-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2021-en-r&anchor=para_73_e&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_a&doctype=Standard -URIDate 2021-03-24 + Details
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