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Lease Arrangements - Right-of-use Assets (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2020
USD ($)
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets $ 27,728.5 $ 17,232.4 $ 987.5
Additions to right-of-use assets 13,481.2 1,033.0  
Depreciation of right-of-use assets 2,681.6 2,622.7  
Income from subleasing right-of-use assets (classified under other operating income and expenses, net) 79.6 55.0  
Land [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 25,141.9 14,064.0  
Depreciation of right-of-use assets 1,312.9 957.1  
Buildings [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 2,544.8 2,351.8  
Depreciation of right-of-use assets 569.5 458.8  
Machinery and equipment [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets   775.8  
Depreciation of right-of-use assets 775.8 1,184.4  
Office equipment [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Right-of-use assets 41.8 40.8  
Depreciation of right-of-use assets $ 23.4 $ 22.4