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Finance Costs - Summary of Finance Costs (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Disclosure of detailed information about borrowings [line items]        
Interest expense, Corporate bonds $ 19,278.1   $ 17,848.9 $ 14,116.1
Lease liabilities 373.4   382.0 267.1
Interest expense, Bank loans 150.8   95.4 32.0
Interest expense, Others 3.4   2.8 1.7
Less: Capitalized interest under property, plant and equipment (9,310.3)   (6,329.7) (2,666.9)
Finance costs $ 10,495.4 $ 320.1 $ 11,999.4 $ 11,750.0
Bottom of range [member]        
Disclosure of detailed information about borrowings [line items]        
Capitalisation rate 1.20% 1.20% 1.08%  
Top of range [member]        
Disclosure of detailed information about borrowings [line items]        
Capitalisation rate 3.34% 3.34% 3.36%