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Short-term Loans - Summary of Short-term Loans (Detail) € in Millions, $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 TWD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 EUR (€) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 EUR (€)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Amount | $ 114,921.3 | $ 88,559.0 | $ 4,142.8 |  |  |
Unsecured Loans [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Amount | $ 114,921.3 | $ 88,559.0 |  |  |  |
Short Term Loans [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Loan content |  |  | $ 0.0 | € 3,652.9 | $ 200.0 | € 2,398.0
Maturity date | 2022-06 | 2021-02 |  |  |  |
Short Term Loans [Member] | Bottom of range [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Annual interest rate | (0.73%) | (0.54%) | (0.73%) | (0.73%) | (0.54%) | (0.54%)
Short Term Loans [Member] | Top of range [member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Annual interest rate | 0.00% | 0.33% | 0.00% | 0.00% | 0.33% | 0.33%

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- Definition The amount of contractual undiscounted cash flows for gross commitments to receive a loan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph B11D -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_B11D_e&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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- Definition The amount of current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
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