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Lease Arrangements - Right-of-use Assets (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
TWD ($)
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2022
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets $ 41,914.0 $ 32,734.4   $ 1,363.9
Additions to right-of-use assets 12,610.7 7,769.8 $ 13,481.2  
Depreciation of right-of-use assets 3,073.0 2,556.2 2,681.6  
Land [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 38,525.8 29,778.6    
Depreciation of right-of-use assets 2,119.8 1,825.7 1,312.9  
Buildings [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 3,356.7 2,918.1    
Depreciation of right-of-use assets 928.7 707.9 569.5  
Machinery and equipment [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 2.9 3.4    
Depreciation of right-of-use assets 0.9 0.5 775.8  
Office equipment [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 28.6 34.3    
Depreciation of right-of-use assets $ 23.6 $ 22.1 $ 23.4