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Income Tax - Additional Information (Detail) - TWD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2018
Disclosure Of Income Taxes [Line Items] |  |  |  |  |
Percentage of tax rate |  | 17.00% | 17.00% | 17.00% |
Aggregate deductible temporary differences for which no deferred income tax assets recognized |  | $ 26,536.3 | $ 1,919.8 |  |
Aggregate taxable temporary differences associated with investments in subsidiaries not recognized as deferred income tax liabilities |  | $ 95,003.3 | $ 83,181.4 |  |
Actual and estimated creditable ratio for distribution of earnings |  | 14.69% | 13.90% |  |
Scenario forecast [member] |  |  |  |  |
Disclosure Of Income Taxes [Line Items] |  |  |  |  |
Increase in deferred tax assets |  |  |  |  | $ 1,473.1
Increase in deferred tax liabilities |  |  |  |  | $ 15.1
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% |  |  |

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- 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 2017-01-01 -Paragraph 81 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_f&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Line items represent concepts included in income taxes. + References No definition available. + Details
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