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

2020
    
December 31,

2021
 
    
NT$
    
NT$
 
    
(In Millions)
    
(In Millions)
 
Investments in debt instruments at FVTOCI
                 
Corporate bonds
   $ 56,593.6      $ 57,253.2  
Agency bonds/Agency mortgage-backed securities
     43,977.1        32,070.1  
Government bonds
     13,459.5        21,345.8  
Asset-backed securities
     8,368.3        8,660.4  
    
 
 
    
 
 
 
    
 
 
 
122,398.5
 
 
  
 
 
 
119,329.5
 
 
    
 
 
    
 
 
 
Investments in equity instruments at FVTOCI
                 
Non-publicly
traded equity investments
     4,514.9        5,887.9  
Publicly traded stocks
     50.0        189.8  
    
 
 
    
 
 
 
     
       4,564.9        6,077.7  
    
 
 
    
 
 
 
    
 
$
 
126,963.4
 
 
  
 
$
 
125,407.2
 
 
    
 
 
    
 
 
 
     
Current
   $ 122,448.5      $ 119,519.3  
Noncurrent
     4,514.9        5,887.9  
    
 
 
    
 
 
 
     
     $ 126,963.4      $ 125,407.2