XML 186 R173.htm IDEA: XBRL DOCUMENT
v3.19.1

Significant Loss from Disasters - Additional Information (Detail) - TWD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2016
Disclosure of types of insurance contracts [abstract] |  |
Earthquake losses |  | $ 2,492.1
Loss from virus outbreak | $ 2,596.0 |

X
- References No definition available. + Details
Name: | ifrs-full_DisclosureOfTypesOfInsuranceContractsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loss from earthquake. + References No definition available. + Details
Name: | tsm_LossFromEarthQuake
Namespace Prefix: | tsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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