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Bonds Payable - Major Terms of Overseas Unsecured Bonds (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Overseas [member] |
Bonds payable [line items] |
Overseas unsecured bonds | $ 1,150.0
Overseas unsecured bonds [member] |
Bonds payable [line items] |
Issuance starting period | 2013-04
Issuance ending period | 2018-04
Coupon Rate | 1.625%
Repayment and Interest Payment | Bullet repayment; interest payable semi-annually

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- Definition The amount of bonds issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Bonds Interest Rate. + References No definition available. + Details
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Namespace Prefix: | tsm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Bonds payable issuance ending period. + References No definition available. + Details
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Namespace Prefix: | tsm_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

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- Definition Bonds payable issuance starting period. + References No definition available. + Details
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Namespace Prefix: | tsm_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

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- Definition Bonds payable. + References No definition available. + Details
Name: | tsm_BondsPayableLineItems
Namespace Prefix: | tsm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Bonds payable repayment and interest payable description. + References No definition available. + Details
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Namespace Prefix: | tsm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_GeographicalAreasAxis=ifrs-full_ForeignCountriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | invest_InvestmentSecuritiesSeriesAxis=tsm_OverseasUnsecuredBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |