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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

X

- 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

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X

- 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

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