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Guarantee Deposits - Summary of Guarantee Deposits (Detail) $ in Millions, $ in Millions | Dec. 31, 2017 TWD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 TWD ($)
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Guarantee deposits [abstract] |  |  |
Capacity guarantee | $ 13,346.6 |  | $ 20,929.3
Receivables guarantee | 2,427.5 |  | 5,560.0
Others | 306.5 |  | 181.3
Guarantee deposits | 16,080.6 |  | 26,670.6
Current portion (classified under accrued expenses and other current liabilities) | 8,493.8 |  | 12,000.2
Noncurrent portion | 7,586.8 | $ 255.9 | 14,670.4
Guarantee deposits | $ 16,080.6 |  | $ 26,670.6

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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