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Operating Segments Information - Geographic Information (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Disclosure of geographical areas [line items]        
Net revenue from external customers $ 1,031,473.6 $ 33,697.3 $ 977,447.2 $ 947,938.3
Non-current Assets 1,090,637.0   1,079,700.6  
Taiwan [member]        
Disclosure of geographical areas [line items]        
Net revenue from external customers     88,046.1 125,106.7
Non-current Assets 1,039,471.3   1,027,963.2  
United States [member]        
Disclosure of geographical areas [line items]        
Net revenue from external customers     635,851.7 626,434.8
Non-current Assets 7,569.8   7,515.9  
China [member]        
Disclosure of geographical areas [line items]        
Net revenue from external customers     110,201.4 82,634.1
Non-current Assets 43,574.5   44,204.9  
Europe, the Middle East and Africa [member]        
Disclosure of geographical areas [line items]        
Net revenue from external customers     69,046.8 58,112.4
Non-current Assets 8.3   8.1  
Japan [member]        
Disclosure of geographical areas [line items]        
Net revenue from external customers     60,628.0 44,373.0
Non-current Assets $ 13.1   8.5  
Others [member]        
Disclosure of geographical areas [line items]        
Net revenue from external customers     $ 13,673.2 $ 11,277.3