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Income Tax - Additional Information (Detail) - TWD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Income Taxes [line items] |  |  |
Aggregate deductible temporary differences for which no deferred income tax assets recognized | $ 66,431.3 | $ 55,521.0 |
Aggregate taxable temporary differences associated with investments in subsidiaries not recognized as deferred income tax liabilities | $ 177,552.8 | $ 152,827.4 |
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% | 20.00% | 20.00%

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- 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 2021-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_e&doctype=Standard -URIDate 2021-03-24 + Details
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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 reported in separate financial statements] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_f&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The applicable "corporate" income tax rate. + References No definition available. + Details
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- Definition Line items represent concepts included in income taxes. + References No definition available. + Details
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- Details
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