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Guarantee Deposits - Summary of Guarantee Deposits (Detail) $ in Millions, $ in Millions | Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($)
--- | --- | --- | ---
Guarantee deposits [abstract] |  |  |
Capacity guarantee |  |  | $ 1,499.4
Others | $ 350.0 |  | 230.5
Guarantee deposits | 350.0 |  | 1,729.9
Current portion (classified under accrued expenses and other current liabilities) | 84.4 |  | 1,553.0
Noncurrent portion | 265.6 | $ 9.5 | 176.9
Guarantee deposits | $ 350.0 |  | $ 1,729.9

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- Definition Capacity guarantee. + References No definition available. + Details
Name: | tsm_CapacityGuarantee
Namespace Prefix: | tsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Current guarantee deposits. + References No definition available. + Details
Name: | tsm_CurrentGuaranteeDeposits
Namespace Prefix: | tsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Guarantee deposits. + References No definition available. + Details
Name: | tsm_GuaranteeDeposits
Namespace Prefix: | tsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Guarantee deposits. + References No definition available. + Details
Name: | tsm_GuaranteeDepositsAbstract
Namespace Prefix: | tsm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of non-current guarantee deposits. + References No definition available. + Details
Name: | tsm_NoncurrentGuaranteeDeposits
Namespace Prefix: | tsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Other guarantee. + References No definition available. + Details
Name: | tsm_OtherGuarantee
Namespace Prefix: | tsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant