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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%

X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2021-01-01
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-URIDate 2021-03-24

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+ References

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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
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-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

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- Definition

The amount of current borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-URIDate 2021-03-24

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- Definition

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+ References

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