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Related Parties Transactions - Compensation of Directors and Other Key Management Personnel (Detail) - TWD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Transactions Between Related Parties [Abstract] |  |  |
Short-term employee benefits | $ 254 | $ 251 | $ 212
Post-employment benefits | 9 | 8 | 9
Share-based payment | 2 | 2 | 3
Compensation of key management personnel | $ 265 | $ 261 | $ 224

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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 2016-01-13 -Paragraph 17 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2016-03-30&anchor=para_17&doctype=Standard -URIDate 2016-03-31 + 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 2016-01-13 -Paragraph 17 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2016-03-30&anchor=para_17_b&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2016-01-13 -Paragraph 17 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2016-03-30&anchor=para_17_e&doctype=Standard -URIDate 2016-03-31 + Details
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