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Lease Arrangements - Minimum Lease Payments Expensed (Detail) - TWD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Finance Lease And Operating Leases By Lessee [Abstract] |  |
Minimum lease payments | $ 4,243.1 | $ 2,178.1

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- Definition The amount of expense recognised on rental activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_85&doctype=Standard -URIDate 2019-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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