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.

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

Name:	ifrs-full_PropertyPlantAndEquipment
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Plant and Equipment - Summary of Property, Plant and Equipment (Detail) $ in Millions, $ in Millions	Dec. 31, 2019 TWD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 TWD ($)	Dec. 31, 2017 TWD ($)
Disclosure Of The Ownership Details Of PropertyPlant And Equipment [Line Items]
Property, plant and equipment	$ 1,352,377.4	$ 45,214.9	$ 1,072,050.3	$ 1,062,542.3
Asset used by the Company [member]
Disclosure Of The Ownership Details Of PropertyPlant And Equipment [Line Items]
Property, plant and equipment	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	$ 63.5