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Significant Operation Losses - Additional Information (Detail) - TWD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Sep. 30, 2018
Significant operation losses [line items]
Loss from virus outbreak		$ 2,596.0
Estimated loss from unqualified photoresist materials	$ 3,400.0

X

- Definition

Estimated loss from unqualified photoresist materials.

+ References

No definition available.

+ Details

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Namespace Prefix:	tsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Loss from virus outbreak.

+ References

No definition available.

+ Details

Name:	tsm_LossFromVirusOutbreak
Namespace Prefix:	tsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Significant operation losses [line item].

+ References

No definition available.

+ Details

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