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Operating Segments Information - Geographic Information (Detail) - TWD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of geographical areas [line items]    
Non-current Assets $ 2,037,267.0 $ 1,613,496.7
Taiwan [member]    
Disclosure of geographical areas [line items]    
Non-current Assets 1,953,007.7 1,569,080.4
United States [member]    
Disclosure of geographical areas [line items]    
Non-current Assets 41,208.7 9,455.5
China [member]    
Disclosure of geographical areas [line items]    
Non-current Assets 41,895.2 34,456.4
Europe, the Middle East and Africa [member]    
Disclosure of geographical areas [line items]    
Non-current Assets 143.9 174.2
Japan [member]    
Disclosure of geographical areas [line items]    
Non-current Assets 1,011.0 327.2
Others [member]    
Disclosure of geographical areas [line items]    
Non-current Assets $ 0.5 $ 3.0