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Lease Arrangements - Right-of-use Assets (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2024
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets $ 40,128.4 $ 40,424.7   $ 1,223.8
Additions to right-of-use assets 4,579.6 2,145.4 $ 12,610.7  
Depreciation of right-of-use assets 3,679.5 3,459.0 3,073.0  
Land [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 36,981.0 37,437.1    
Depreciation of right-of-use assets 2,541.9 2,459.1 2,119.8  
Buildings [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 3,103.9 2,946.0    
Depreciation of right-of-use assets 1,114.3 976.1 928.7  
Machinery and equipment [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Depreciation of right-of-use assets 0.0 0.4 0.9  
Office equipment [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 43.5 41.6    
Depreciation of right-of-use assets $ 23.3 $ 23.4 $ 23.6