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Income Tax - Current Tax Assets and Liabilities (Detail) $ in Millions, $ in Millions | Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($)
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Major Components Of Tax Expense Income [Abstract] |  |  |
Tax refund receivable (included in other current assets - other) | $ 1 |  | $ 1
Income tax payable | $ 6,157 | $ 219 | $ 5,812

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- Definition The current amount of current tax liabilities. [Refer: Current tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph n -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_n&doctype=Standard -URIDate 2020-01-01 + Details
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