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Other Current Monetary Assets - Summary of Other Current Monetary Assets (Detail) $ in Millions, $ in Millions	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)
Disclosure Of Other Current Monetary Assets [Abstract]
Time deposits and negotiable certificates of deposit with maturities of more than three months	$ 4,596		$ 5,959
Repurchase agreements collateralized by bonds with maturities of more than three months	0		15
Others	1,528		1,524
Other current monetary assets	$ 6,124	$ 218	$ 7,498

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- Definition

Disclosure of other current monetary assets.

+ References

No definition available.

+ Details

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- Definition

Miscellaneous other current monetary assets.

+ References

No definition available.

+ Details

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- Definition

Repurchase agreements collateralized by bonds with maturities.

+ References

No definition available.

+ Details

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- Definition

The amount of current financial assets that the entity does not separately disclose in the same statement or note. [Refer: Other financial assets; Current financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 54
-Subparagraph d
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- Definition

The amount of short-term deposits held by the entity that are not classified as cash equivalents. [Refer: Cash equivalents]

+ 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
-URIDate 2020-01-01

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