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Income Tax - Additional Information (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disclosure Of Income Taxes [line items]
Percentage of tax rate		17.00%	17.00%
Aggregate deductible temporary differences for which no deferred income tax assets recognized	$ 20,060.9	$ 26,536.3
Aggregate taxable temporary differences associated with investments in subsidiaries not recognized as deferred income tax liabilities	$ 112,893.0	$ 95,003.3
Changes in tax rates or tax laws enacted or announced [member]
Disclosure Of Income Taxes [line items]
Percentage of corporate income tax rate	20.00%	17.00%
Percentage of tax rate surtax imposed on unappropriated earnings	5.00%	10.00%

X

- Definition

The applicable income tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2018-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard
-URIDate 2018-03-16

+ Details

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X

- Definition

The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2018-01-01
-Paragraph 81
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_e&doctype=Standard
-URIDate 2018-03-16

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X

- Definition

The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Associates [member]; Subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2018-01-01
-Paragraph 81
-Subparagraph f
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_f&doctype=Standard
-URIDate 2018-03-16

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X

- Definition

The applicable "corporate" income tax rate.

+ References

No definition available.

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X

- Definition

Line items represent concepts included in income taxes.

+ References

No definition available.

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X

- Definition

Surtax imposed tax rate on unappropriated earnings.

+ References

No definition available.

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- Details

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