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Financial Assets at Fair Value Through Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2020
Text Block [Abstract]  
Summary of Financial Assets at Fair Value through Other Comprehensive Income
   
December 31,

2019
   
December 31,

2020
 
   
NT$
   
NT$
 
   
(In Millions)
   
(In Millions)
 
Investments in debt instruments at FVTOCI
          
Corporate bonds
  $51,790.0   $56,593.6 
Agency bonds/Agency mortgage-backed securities
   51,966.5    43,977.1 
Government bonds
   12,824.2    13,459.5 
Asset-backed securities
   10,815.9    8,368.3 
   
 
 
   
 
 
 
   
    127,396.6    122,398.5 
   
 
 
   
 
 
 
Investments in equity instruments at FVTOCI
          
Non-publicly
traded equity investments
   4,124.3    4,514.9 
Publicly traded stocks
   —    50.0 
   
 
 
   
 
 
 
   
    4,124.3    4,564.9 
   
 
 
   
 
 
 
   
   $131,520.9   $126,963.4 
   
 
 
   
 
 
 
   
Current
  $127,396.6   $122,448.5 
Noncurrent
   4,124.3    4,514.9 
   
 
 
   
 
 
 
   
   $131,520.9   $126,963.4