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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