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Guarantee Deposits - Summary of Guarantee Deposits (Detail) $ in Millions, $ in Millions | Dec. 31, 2018 TWD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 TWD ($)
--- | --- | --- | ---
Guarantee deposits [abstract] |  |  |
Capacity guarantee | $ 9,289.6 |  | $ 13,346.6
Receivables guarantee | 653.7 |  | 2,427.5
Others | 245.7 |  | 306.5
Guarantee deposits | 10,189.0 |  | 16,080.6
Current portion (classified under accrued expenses and other current liabilities) | 6,835.7 |  | 8,493.8
Noncurrent portion | 3,353.3 | $ 109.6 | 7,586.8
Guarantee deposits | $ 10,189.0 |  | $ 16,080.6

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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

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