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Financial Assets at Amortized Cost - Schedule of Financial Assets at Amortized Cost (Detail) $ in Millions, $ in Millions | Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2020 TWD ($)
--- | --- | --- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |  |  |
Corporate bonds | $ 145,960.6 |  | $ 129,727.4 |  |
Less: Allowance for impairment loss | (531.5) |  | (331.6) | $ (347.0) | $ (246.6)
Current portion | 66,761.2 | $ 2,180.3 | 94,600.2 |  |
Noncurrent portion | 79,199.4 | $ 2,586.5 | 35,127.2 |  |
Corporate bonds [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Corporate bonds | 113,851.9 |  | 81,041.0 |  |
Less: Allowance for impairment loss | (82.7) |  | (56.4) |  |
Commercial paper [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Debt instruments held | 18,387.9 |  | 48,742.8 |  |
Government bonds/Agency bonds [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Debt instruments held | $ 13,803.5 |  | $ 0.0 |  |

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- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expired 2023-01-01 -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 16 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2023-03-23 + Details
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- Definition The amount of debt instruments held by the entity that were issued by a corporate entity. [Refer: Debt instruments held] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_112_c&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of current financial assets measured at amortised cost. [Refer: Financial assets at amortised cost] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 8 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_8_f&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of instruments representing indebtedness held by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of non-current financial assets measured at amortised cost. [Refer: Financial assets at amortised cost] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 8 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_8_f&doctype=Standard -URIDate 2023-03-23 + Details
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