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Significant Assets and Liabilities Denominated in Foreign Currencies (Tables)
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Summary of Significant Assets and Liabilities Denominated in Foreign Currencies
The following information was aggregated by the foreign currencies other than functional currencies of the group entities and the exchange rates between foreign currencies and respective functional currencies were disclosed. The significant financial assets and liabilities denominated in foreign currencies were as follows:
 
  
Foreign
Currencies

(In Thousand)
 
  
Exchange Rate
 
  
Carrying Amount

(In Thousand)
 
       
            December 31, 2020            
  
      
  
      
  
      
       
Monetary financial assets
  
      
  
      
  
      
US$
    $ 4,269,075        US$1=NT$28.48      $ 121,583,265  
US$
      1,527,381        US$1=RMB6.5249        43,499,803  
US$
      41,643        US$1=EUR0.8143        1,185,984  
JPY
      13,544,360        JPY1=NT$0.2763        3,742,306  
JPY
      1,174,208        JPY1=US$0.0097        324,434  
HKD
      174,765        HKD1=NT$3.6730        641,912  
       
Monetary financial liabilities
                           
US$
      4,439,915        US$1=NT$28.48        126,448,786  
US$
      1,517,568        US$1=RMB6.5249        43,220,325  
US$
      20,896        US$1=EUR0.8143        595,128  
JPY
      13,657,967        JPY1=NT$0.2763        3,773,695  
JPY
      1,188,650        JPY1=US$0.0097        328,424  
HKD
      18,814        HKD1=NT$3.6730        69,103  
       
            December 31, 2021            
                           
       
Monetary financial assets
                           
US$
      4,885,163        US$1=NT$27.68        135,221,324  
US$
      1,718,314        US$1=RMB6.3757        47,562,940  
US$
      42,250        US$1=EUR0.8829        1,169,492  
JPY
      12,584,942        JPY1=NT$0.2405        3,026,677  
JPY
      551,496        JPY1=US$0.0087        132,635  
       
Monetary financial liabilities
                           
US$
      4,899,633        US$1=NT$27.68        135,621,853  
US$
      1,503,606        US$1=RMB6.3757        41,619,803  
US$
      88,741        US$1=EUR0.8829        2,456,363  
JPY
      14,078,075        JPY1=NT$0.2405        3,385,776  
JPY
      990,667        JPY1=US$0.0087        238,255  
Summary of Realized and Unrealized Foreign Exchange Gain (Loss)
The significant realized and unrealized foreign exchange gain (loss) were as follows: 
 
 
  
For the Year Ended December 31
 
 
  
2019
 
 
2020
 
 
2021
 
Functional
Currencies
  
Exchange Rate
  
Net Foreign
Exchange Gain
(Loss)
 
 
Exchange Rate
  
Net Foreign
Exchange Gain
(Loss)
 
 
Exchange Rate
  
Net Foreign

Exchange Gain (Loss)
 
 
  
 
  
NT$
 
 
 
  
NT$
 
 
 
  
NT$
 
 
US$ (Note 4)
 
               
US$
    US$1=NT$29.98    $ (84,177 )    US$1=NT$28.48    $ (143,804 )    US$1=NT$27.68    $ 132,582     $ 4,780  
NT$
           1,203,823            1,382,067            1,413,969       50,972  
RMB
    RMB1=NT$4.2975      14,055     RMB1=NT$4.3648      (181,624 )    RMB1=NT$4.3415      (85,675 )      (3,089 ) 
         
 
 
         
 
 
         
 
 
    
 
 
  
               
          $ 1,133,701          $ 1,056,639          $ 1,460,876     $ 52,663