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Net Revenue - Additional Information (Detail) - TWD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of refund liabilities [line items] |  |
Revenue from contracts with customers | $ 1,069,985.4 | $ 1,031,473.6
Accrued expenses and other current liabilities [member] |  |
Disclosure of refund liabilities [line items] |  |
Revenue from contracts with customers | 3,876.6 | 31,770.0
Estimated sales returns and other allowances | 36,211.4 | 55,406.0
Refund liabilities | $ 19,620.2 | $ 22,672.6

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- Definition The amount of revenue from contracts with customers. A customer is a party that has contracted with an entity to obtain goods or services that are an output of the entity’s ordinary activities in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2019-01-01 -Paragraph 113 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_113_a&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2019-01-01 -Paragraph 114 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_114&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Disclosure of refund liabilities + References No definition available. + Details
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- Details
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