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Pledged Assets - Additional Information (Detail) - TWD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Certificates of deposit [member]
Disclosure of Pledged Assets [Line Items]
Financial assets pledged as collateral	$ 135.4	$ 114.5

X

- Definition

The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 14
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_14_a&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Pledged assets.

+ References

No definition available.

+ Details

Name:	tsm_DisclosureOfPledgedAssetsLineItems
Namespace Prefix:	tsm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	ifrs-full_CategoriesOfFinancialAssetsAxis=tsm_CertificatesOfDepositMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: