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Financial Assets at Fair Value Through Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2021
Text Block [Abstract]  
Summary of Financial Assets at Fair Value through Other Comprehensive Income
    
December 31,

2020
     
June 30,

2021
  
    
NT$
     
NT$
  
    
(In Millions)
     
(In Millions)
  
Investments in debt instruments at FVTOCI
                  
Corporate bonds
    $ 56,593.6      $ 58,907.9  
Agency bonds/Agency mortgage-backed securities
      43,977.1        32,188.8  
Government bonds
      13,459.5        24,121.9  
Asset-backed securities
      8,368.3        7,523.4  
    
 
 
     
 
 
  
     
       122,398.5        122,742.0  
    
 
 
     
 
 
  
Investments in equity instruments at FVTOCI
                  
Non-publicly
traded equity investments
      4,514.9        5,390.0  
Publicly traded stocks
      50.0        52.5  
    
 
 
     
 
 
  
     
       4,564.9        5,442.5  
    
 
 
     
 
 
  
     
     $ 126,963.4      $ 128,184.5  
    
 
 
     
 
 
  
     
Current
    $ 122,448.5      $ 122,794.5  
Noncurrent
      4,514.9        5,390.0  
    
 
 
     
 
 
  
     
     $ 126,963.4      $ 128,184.5