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Intangible Assets - Additional Information (Detail) - TWD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2017 | Dec. 31, 2015 | Dec. 31, 2017
Disclosure of detailed information about intangible assets [Line Items] |  |  |
4G concession fees | $ 10,935 | $ 9,955 |
Computer software [Member] | Bottom of range [Member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Estimated useful lives |  |  | P1Y
Computer software [Member] | Top of range [Member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Estimated useful lives |  |  | P10Y
Others [Member] | Bottom of range [Member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Estimated useful lives |  |  | P1Y
Others [Member] | Top of range [Member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Estimated useful lives |  |  | P20Y

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- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2016-01-13 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2016-03-30&anchor=para_118_e_i&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The useful lives or amortisation rates used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2016-01-13 -Paragraph 118 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2016-03-30&anchor=para_118_a&doctype=Standard -URIDate 2016-03-31 + Details
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- Details
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- Details
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- Details
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- Details
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