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Financial Instruments at Fair Value Through Profit or Loss - Summary of Financial Instruments at Fair Value through Profit or Loss (Detail) $ in Millions, $ in Millions	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)
Financial assets-current
Financial assets-current, Mandatorily measured at FVTPL	$ 10		$ 1
Financial assets-noncurrent
Non-derivatives	677		778
Financial liabilities-current
Financial liabilities held for trading, Derivatives (not designated for hedge), Forward exchange contracts	0	$ 0	0
Forward exchange contracts [Member]
Financial assets-current
Derivatives (not designated for hedge)	2		0
Listed stocks domestic [Member]
Financial assets-current
Non-derivatives	8		1
Non listed stocks domestic [Member]
Financial assets-noncurrent
Non-derivatives	441		511
Non listed stocks foreign [Member]
Financial assets-noncurrent
Non-derivatives	$ 236		$ 267

X

- Definition

Current nonderivative financial assets.

+ References

No definition available.

+ Details

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X

- Definition

Noncurrent nonderivative financial assets.

+ References

No definition available.

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- References

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- References

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- References

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- Definition

The amount of current derivative financial assets. [Refer: Derivative financial assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard
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- Definition

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]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 7
-IssueDate 2020-01-01
-Paragraph 8
-Subparagraph a
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- Definition

The amount of current financial liabilities at fair value through profit or loss that meet the definition of held for trading. [Refer: Current financial liabilities at fair value through profit or loss]

+ References

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