Financial Assets and Liabilities at Fair Value through Profit or Loss - Summary of Financial Assets and Liabilities at Fair Value through Profit or Loss (Detail) $ in Millions, $ in Millions	Dec. 31, 2024 TWD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 TWD ($)
Disclosure of detailed information about financial instruments [line items]
Financial assets, Mandatorily measured at FVTPL	$ 15,407.5		$ 14,342.1
Current	207.7		924.6
Noncurrent	15,199.8	$ 463.6	13,417.5
Total	15,407.5		14,342.1
Convertible Preferred Stock [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets, Mandatorily measured at FVTPL	14,181.8		13,307.2
Mutual funds [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets, Mandatorily measured at FVTPL	886.9		110.3
Forward exchange contracts [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets, Mandatorily measured at FVTPL	207.7		701.2
Financial liabilities, Held for trading	466.5		121.4
Simple Agreement For Future Equity [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets, Mandatorily measured at FVTPL	131.1		0.0
Convertible Bonds [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets, Mandatorily measured at FVTPL	$ 0.0		$ 223.4

The amount of current financial assets mandatorily measured at fair value through profit or loss in accordance with IFRS 9. [Refer: Financial assets at fair value through profit or loss, mandatorily measured at fair value]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 8
-Subparagraph a
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-URIDate 2024-03-27

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets]

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The amount of financial assets mandatorily measured at fair value through profit or loss in accordance with IFRS 9. [Refer: Financial assets at fair value through profit or loss]

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The amount of financial liabilities at fair value through profit or loss that meet the definition of held for trading. A financial liability is classified as held for trading if: (a) it is acquired or incurred principally for the purpose of selling or repurchasing it in the near term; (b) on initial recognition it is part of a portfolio of identified financial instruments that are managed together and for which there is evidence of a recent actual pattern of short-term profit-taking; or (c) it is a derivative (except for a derivative that is a financial guarantee contract or a designated and effective hedging instrument). [Refer: Financial liabilities at fair value through profit or loss]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 8
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_8_e&doctype=Standard
-URIDate 2024-03-27

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The amount of non-current financial assets mandatorily measured at fair value through profit or loss in accordance with IFRS 9. [Refer: Financial assets at fair value through profit or loss, mandatorily measured at fair value]

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