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Operating Segments Information - Geographic Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of geographical areas [line items]        
Net revenue from external customers $ 1,069,985.4 $ 35,773.5 $ 1,031,473.6 $ 977,447.2
Non-current Assets 1,392,005.7   1,090,637.0  
Taiwan [member]        
Disclosure of geographical areas [line items]        
Net revenue from external customers       88,046.1
Non-current Assets 1,344,352.6   1,039,471.3  
United States [member]        
Disclosure of geographical areas [line items]        
Net revenue from external customers       635,851.7
Non-current Assets 8,850.1   7,569.8  
China [member]        
Disclosure of geographical areas [line items]        
Net revenue from external customers       110,201.4
Non-current Assets 38,586.6   43,574.5  
Europe, the Middle East and Africa [member]        
Disclosure of geographical areas [line items]        
Net revenue from external customers       69,046.8
Non-current Assets 186.2   8.3  
Japan [member]        
Disclosure of geographical areas [line items]        
Net revenue from external customers       60,628.0
Non-current Assets 27.1   $ 13.1  
Others [member]        
Disclosure of geographical areas [line items]        
Net revenue from external customers       $ 13,673.2
Non-current Assets $ 3.1