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Financial Assets at Fair Value Through Other Comprehensive Income (Tables)
12 Months Ended
Dec. 31, 2022
Text Block [Abstract]  
Summary of Financial Assets at Fair Value through Other Comprehensive Income
    
December 31,

2021
    
December 31,

2022
 
    
NT$
    
NT$
 
    
(In Millions)
    
(In Millions)
 
Investments in debt instruments at FVTOCI
                 
Corporate bonds
   $ 57,253.2      $ 66,116.2  
Agency bonds/Agency mortgage-backed securities
     32,070.1        28,399.9  
Government bonds
     21,345.8        18,929.8  
Asset-backed securities
     8,660.4        9,274.7  
    
 
 
    
 
 
 
     
       119,329.5        122,720.6  
    
 
 
    
 
 
 
     
Investments in equity instruments at FVTOCI
                 
Non-publicly traded equity investments
     5,887.9        6,159.2  
Publicly traded stocks
     189.8        277.9  
    
 
 
    
 
 
 
     
       6,077.7        6,437.1  
    
 
 
    
 
 
 
     
     $ 125,407.2      $ 129,157.7  
    
 
 
    
 
 
 
     
Current
   $ 119,519.3      $ 122,998.5  
Noncurrent
     5,887.9        6,159.2  
    
 
 
    
 
 
 
     
     $ 125,407.2      $ 129,157.7