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Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2020
Text Block [Abstract]  
Summary of Intangible Assets
   
Goodwill
   
Technology
License Fees
   
Software and
System Design
Costs
   
Patent and
Others
   
Total
 
   
NT$
   
NT$
   
NT$
   
NT$
   
NT$
 
   
(In Millions)
   
(In Millions)
   
(In Millions)
   
(In Millions)
   
(In Millions)
 
Cost
          
Balance at January 1, 2018
  $5,648.7   $10,443.3   $25,186.3   $5,716.0   $46,994.3 
Additions
       533.7    4,601.9    1,969.4    7,105.0 
Disposals or retirements
           (186.7   (31.2   (217.9
Effect of exchange rate changes
   146.8    (2.5   (6.9   2.1    139.5 
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Balance at December 31, 2018
  $5,795.5   $10,974.5   $29,594.6   $7,656.3   $54,020.9 
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Accumulated amortization and impairment
          
Balance at January 1, 2018
  $   $7,694.9   $20,376.7   $4,747.5   $32,819.1 
Additions
       1,063.6    2,835.3    522.5    4,421.4 
Disposals or retirements
           (186.6   (31.2   (217.8
Effect of exchange rate changes
       (2.5   (1.7   0.3    (3.9
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Balance at December 31, 2018
  $   $8,756.0   $23,023.7   $5,239.1   $37,018.8 
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Carrying amounts at December 31, 2018
  $5,795.5   $2,218.5   $6,570.9   $2,417.2   $17,002.1 
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Cost
          
Balance at January 1, 2019
  $5,795.5   $10,974.5   $29,594.6   $7,656.3   $54,020.9 
Additions
       4,879.6    3,710.4    647.8    9,237.8 
Disposals or retirements
           (260.9       (260.9
Effect of exchange rate changes
   (102.1   0.9    (20.1   (1.2   (122.5
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Balance at December 31, 2019
  $5,693.4   $15,855.0   $33,024.0   $8,302.9   $62,875.3 
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Accumulated amortization and impairment
          
Balance at January 1, 2019
  $   $8,756.0   $23,023.7   $5,239.1   $37,018.8 
Additions
       1,066.9    3,747.3    658.2    5,472.4 
Disposals or retirements
           (258.6       (258.6
Effect of exchange rate changes
       0.9    (10.3   (0.9   (10.3
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Balance at December 31, 2019
  $   $9,823.8   $26,502.1   $5,896.4   $42,222.3 
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Carrying amounts at December 31, 2019
  $5,693.4   $6,031.2   $6,521.9   $2,406.5   $20,653.0 
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Cost
          
Balance at January 1, 2020
  $5,693.4   $15,855.0   $33,024.0   $8,302.9   $62,875.3 
Additions
       6,308.9    3,275.8    2,974.8    12,559.5 
Disposals or retirements
           (60.5       (60.5
Effect of exchange rate changes
   (256.8   (2.2   (0.3   (0.1   (259.4
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Balance at December 31, 2020
  $5,436.6   $22,161.7   $36,239.0   $11,277.6   $75,114.9 
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Accumulated amortization and impairment
          
Balance at January 1, 2020
  $   $9,823.8   $26,502.1   $5,896.4   $42,222.3 
Additions
       2,404.5    3,669.2    1,112.5    7,186.2 
Disposals or retirements
           (59.9       (59.9
Effect of exchange rate changes
       (2.1   0.3        (1.8
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Balance at December 31, 2020
  $   $12,226.2   $30,111.7   $7,008.9   $49,346.8 
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Carrying amounts at December 31, 2020
  $5,436.6   $9,935.5   $6,127.3   $4,268.7   $25,768.1