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Lease Arrangements - Right-of-use Assets (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
TWD ($)
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2023
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets $ 40,424.7 $ 41,914.0   $ 1,320.2
Additions to right-of-use assets 2,145.4 12,610.7 $ 7,769.8  
Depreciation of right-of-use assets 3,459.0 3,073.0 2,556.2  
Land [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 37,437.1 38,525.8    
Depreciation of right-of-use assets 2,459.1 2,119.8 1,825.7  
Buildings [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 2,946.0 3,356.7    
Depreciation of right-of-use assets 976.1 928.7 707.9  
Machinery and equipment [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 0.0 2.9    
Depreciation of right-of-use assets 0.4 0.9 0.5  
Office equipment [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 41.6 28.6    
Depreciation of right-of-use assets $ 23.4 $ 23.6 $ 22.1