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Financial Assets at Fair Value Through Other Comprehensive Income - Additional Information (Detail) - TWD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020
Financial assets at fair value through other comprehensive income [abstract]
Cumulative loss allowance for expected credit loss	$ 33.9	$ 34.7

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- References

No definition available.

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Namespace Prefix:	ifrs-full_
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- Definition

Cumulative loss allowance for expected credit loss at fair value through other comprehensive income.

+ References

No definition available.

+ Details

Name:	tsm_CumulativeLossAllowanceForExpectedCreditLossAtFairValueThroughOtherComprehensiveIncome
Namespace Prefix:	tsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant