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Lease Arrangements - Minimum Lease Payments Expensed (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2018 TWD ($)
Disclosure Of Finance Lease And Operating Leases By Lessee [Abstract]
Minimum lease payments	$ 4,243.1

X

- Definition

The amount of expense recognised on rental activities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 85
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_RentalExpense
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Disclosure Of Finance Lease And Operating Leases By Lessee

+ References

No definition available.

+ Details

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