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Property, Plant and Equipment - Summary of Assets Used by the Company (Detail) $ in Millions, $ in Millions | Dec. 31, 2019 TWD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
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Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Assets used by the Company | $ 283,694 | $ 9,484 | $ 287,605 | $ 288,914
Assets Subject to Operating Leases [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Assets used by the Company | 7,324 |  |  |
Assets Used by the Company [Member] |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |
Assets used by the Company | $ 276,370 |  |  |

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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 2019-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_a&doctype=Standard -URIDate 2019-03-27 + Details
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