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v3.19.1

Related Party Transactions - Compensation to Directors and Other Key Management Personnel (Detail) - TWD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of transactions between related parties [abstract] |  |  |
Short-term employee benefits | $ 2,004.9 | $ 2,170.3 | $ 2,024.0
Post-employment benefits | 3.4 | 3.7 | 4.0
Compensation of key management personnel | $ 2,008.3 | $ 2,174.0 | $ 2,028.0

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- Definition The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2018-01-01 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2018-03-01&anchor=para_17&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2018-01-01 -Paragraph 17 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2018-03-01&anchor=para_17_b&doctype=Standard -URIDate 2018-03-16 + Details
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