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Investments Accounted for Using Equity Method (Tables)
 12 Months Ended
Dec. 31, 2019
TextBlock [abstract]  
Summary of Investments in Associates
Associates consisted of the following:
 
     
Place of
  
Carrying Amount
   
% of Ownership and Voting Rights
Held by the Company
Name of Associate
  
Principal Activities
 
Incorporation and
Operation
  
December 31,
2018
   
December 31,
2019
   
December 31,
2018
 
December 31,
2019
        
NT$
   
NT$
      
        
(In Millions)
   
(In Millions)
      
Vanguard International Semiconductor Corporation (VIS)
  
Manufacturing, selling, packaging, testing and computer-aided design of integrated circuits and other semiconductor devices and the manufacturing and design service of masks
 Hsinchu, Taiwan  $8,924.8   $8,960.5   28% 28%
Systems on Silicon Manufacturing Company Pte Ltd. (SSMC)
  
Manufacturing and selling of integrated circuits and other semiconductor devices
 Singapore   5,772.8    6,502.2   39% 39%
Xintec Inc. (Xintec)
  
Wafer level chip size packaging and wafer level post passivation interconnection service
 Taoyuan, Taiwan   1,764.6    1,842.8   41% 41%
Global Unichip Corporation (GUC)
  
Researching, developing, manufacturing, testing and marketing of integrated circuits
 Hsinchu, Taiwan   1,283.9    1,274.8   35% 35%
Mutual-Pak
  
Manufacturing of electronic parts, wholesaling and retailing of electronic materials, and researching, developing and testing of RFID
 New Taipei, Taiwan   22.9    38.5   39% 28%
     
 
 
   
 
 
    
     $17,769.0   $18,618.8    
     
 
 
   
 
 
    
Summary of Market Prices of Investments Accounted for Using Equity Method in Publicly Traded Stocks Calculated by Closing Price at End of Reporting Period
   
December 31,
2018
   
December 31,

2019
 
   
NT$
   
NT$
 
Name of Associate
  
(In Millions)
   
(In Millions)
 
VIS
  $27,621.3   $36,812.9 
  
 
 
   
 
 
 
GUC
  $9,617.7   $11,251.8 
  
 
 
   
 
 
 
Xintec
  $3,783.6   $8,958.2