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Financial Assets at Amortized Cost - Schedule of Financial Assets at Amortized Cost (Detail) $ in Millions, $ in Millions | Dec. 31, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
--- | --- | --- | --- | --- | ---
Disclosure of financial assets [line items] |  |  |  |  |
Corporate bonds | $ 129,727.4 |  | $ 5,307.0 |  |
Less: Allowance for impairment loss | (331.6) |  | (347.0) | $ (246.6) | $ (325.3)
Current portion | 94,600.2 | $ 3,078.4 | 3,773.6 |  |
Noncurrent portion | 35,127.2 | $ 1,143.1 | 1,533.4 |  |
Corporate bonds [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Corporate bonds | 81,041.0 |  | 5,310.1 |  |
Less: Allowance for impairment loss | (56.4) |  | (3.1) |  |
Commercial paper [member] |  |  |  |  |
Disclosure of financial assets [line items] |  |  |  |  |
Commercial paper | $ 48,742.8 |  | $ 0.0 |  |

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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 2022-03-24 -Paragraph 8 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_8_f&doctype=Standard -URIDate 2022-03-24 + Details
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