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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, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Financial assets-current
Financial assets-current, Mandatorily measured at FVTPL	$ 3		$ 10
Financial assets-noncurrent
Non-derivatives	909		677
Financial liabilities-current
Financial liabilities held for trading, Derivatives (not designated for hedge), Forward exchange contracts	6	$ 0	0
Forward exchange contracts [Member]
Financial assets-current
Derivatives (not designated for hedge)	0		2
Listed stocks domestic [Member]
Financial assets-current
Non-derivatives	3		8
Non listed stocks domestic [Member]
Financial assets-noncurrent
Non-derivatives	648		441
Non listed stocks foreign [Member]
Financial assets-noncurrent
Non-derivatives	237		236
Limited partnership - domestic [Member]
Financial assets-noncurrent
Non-derivatives	$ 24		$ 0

X

- Definition

Current nonderivative financial assets.

+ References

No definition available.

+ Details

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- Definition

Noncurrent nonderivative financial assets.

+ References

No definition available.

+ Details

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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 2021-01-01
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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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-IssueDate 2021-01-01
-Paragraph 8
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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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