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Lease Arrangements - Right-of-use Assets (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2021
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets $ 32,734.4 $ 27,728.5   $ 1,180.0
Additions to right-of-use assets 7,769.8 13,481.2 $ 1,033.0  
Depreciation of right-of-use assets 2,556.2 2,681.6 2,622.7  
Income from subleasing right-of-use assets (classified under other operating income and expenses, net) 82.0 79.6 55.0  
Land [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 29,778.6 25,141.9    
Depreciation of right-of-use assets 1,825.7 1,312.9 957.1  
Buildings [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 2,918.1 2,544.8    
Depreciation of right-of-use assets 707.9 569.5 458.8  
Machinery and equipment [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 3.4      
Depreciation of right-of-use assets 0.5 775.8 1,184.4  
Office equipment [member]        
Disclosure of quantitative information about right-of-use assets [line items]        
Right-of-use assets 34.3 41.8    
Depreciation of right-of-use assets $ 22.1 $ 23.4 $ 22.4