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Significant Subsequent Events - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2019 TWD ($)
Unqualified photoresist materials [member]
Disclosure of non-adjusting events after reporting period [line items]
Loss from wafer contamination Loss from water contamination	$ 3,400.0

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Preliminary estimated loss from wafer contamination.

+ References

No definition available.

+ Details

Name:	tsm_LossFromWaferContamination
Namespace Prefix:	tsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=tsm_UnqualifiedPhotoresistMaterialsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: