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Guarantee Deposits (Tables)
12 Months Ended
Dec. 31, 2020
Text Block [Abstract]  
Summary of Guarantee Deposits
   
December 31,
2019
   
December 31,
2020
 
   
NT$
   
NT$
 
   
(In Millions)
   
(In Millions)
 
Capacity guarantee
  $1,499.4   $ 
Others
   230.5    350.0 
  
 
 
   
 
 
 
  $1,729.9   $350.0 
  
 
 
   
 
 
 
Current portion (classified under accrued expenses and other current liabilities)
  $1,553.0   $84.4 
Noncurrent portion
   176.9    265.6 
  
 
 
   
 
 
 
  $1,729.9   $350.0