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Pledged Assets - Assets Pledged as Collaterals (Detail) - TWD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Subclassifications Of Assets Liabilities And Equities [Abstract] |  |
Property, plant and equipment | $ 2,520 | $ 2,550
Land held under development (included in inventories) | 1,999 | 1,999
Restricted assets (included in other assets - others) | 3 | 3
Assets pledged as collateral | $ 4,522 | $ 4,552

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- Definition Restricted deposits collateral pledged as security for liabilities. + References No definition available. + Details
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- Definition The fair value of collateral held that is permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 15 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_15_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of inventories pledged as security for liabilities. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2018-01-01 -Paragraph 36 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=2&date=2018-03-01&anchor=para_36_h&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of property, plant and equipment pledged as security for liabilities. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 74 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_74_a&doctype=Standard -URIDate 2018-03-16 + Details
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- References No definition available. + Details
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