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Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2019
TextBlock [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, 2017
  $6,008.0   $9,546.0   $22,243.6   $5,386.4   $43,184.0 
Additions
       897.9    3,021.1    349.2    4,268.2 
Retirements
           (75.2       (75.2
Reclassification
           7.7    (18.0   (10.3
Effect of disposal of subsidiary
   (13.5       (7.7       (21.2
Effect of exchange rate changes
   (345.8   (0.6   (3.2   (1.6   (351.2
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Balance at December 31, 2017
  $5,648.7   $10,443.3   $25,186.3   $5,716.0   $46,994.3 
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Accumulated amortization and impairment
          
Balance at January 1, 2017
  $   $6,147.2   $18,144.5   $4,277.5   $28,569.2 
Additions
       1,548.3    2,310.7    487.7    4,346.7 
Retirements
           (75.2       (75.2
Reclassification
           7.4    (17.1   (9.7
Impairment
   13.5                13.5 
Effect of disposal of subsidiary
   (13.5       (7.6       (21.1
Effect of exchange rate changes
       (0.6   (3.1   (0.6   (4.3
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Balance at December 31, 2017
  $   $7,694.9   $20,376.7   $4,747.5   $32,819.1 
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Carrying amounts at December 31, 2017
  $5,648.7   $2,748.4   $4,809.6   $968.5   $14,175.2 
  
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
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