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Property, Plant and Equipment - Additional Information (Detail) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2020 TWD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |
Impairment loss on property, plant and equipment |  | $ 299,000,000 | $ 10 | $ 0 | $ 0
Property, plant and equipment subject to operating leases [member] | Bottom of Range [Member] |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |
Lease period |  | 1 year | 1 year |  |
Property, plant and equipment subject to operating leases [member] | Top of Range [Member] |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |
Lease period |  | 20 years | 20 years |  |
Assets Used by the Company [Member] |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |
Impairment loss on property, plant and equipment |  | $ 299,000,000 |  | $ 0 | $ 0
MOTC [Member] | Assets Used by the Company [Member] |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |
Difference between assessed value and construction cost of land | $ 1,057,000,000 |  |  |  |

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