XML 127 R105.htm IDEA: XBRL DOCUMENT v3.21.1
Intangible Assets - Summary of Intangible Assets (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Dec. 31, 2018
TWD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance $ 20,653.0   $ 17,002.1  
Ending balance 25,768.1 $ 917.7 20,653.0 $ 17,002.1
Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 62,875.3   54,020.9 46,994.3
Additions 12,559.5   9,237.8 7,105.0
Disposals or retirements (60.5)   (260.9) (217.9)
Effect of exchange rate changes (259.4)   (122.5) 139.5
Ending balance 75,114.9   62,875.3 54,020.9
Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 42,222.3   37,018.8 32,819.1
Additions 7,186.2   5,472.4 4,421.4
Disposals or retirements (59.9)   (258.6) (217.8)
Effect of exchange rate changes (1.8)   (10.3) (3.9)
Ending balance 49,346.8   42,222.3 37,018.8
Goodwill [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 5,693.4   5,795.5  
Ending balance 5,436.6   5,693.4 5,795.5
Goodwill [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 5,693.4   5,795.5 5,648.7
Effect of exchange rate changes (256.8)   (102.1) 146.8
Ending balance 5,436.6   5,693.4 5,795.5
Technology license fees [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 6,031.2   2,218.5  
Ending balance 9,935.5   6,031.2 2,218.5
Technology license fees [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 15,855.0   10,974.5 10,443.3
Additions 6,308.9   4,879.6 533.7
Effect of exchange rate changes (2.2)   0.9 (2.5)
Ending balance 22,161.7   15,855.0 10,974.5
Technology license fees [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 9,823.8   8,756.0 7,694.9
Additions 2,404.5   1,066.9 1,063.6
Effect of exchange rate changes (2.1)   0.9 (2.5)
Ending balance 12,226.2   9,823.8 8,756.0
Software and system design costs [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 6,521.9   6,570.9  
Ending balance 6,127.3   6,521.9 6,570.9
Software and system design costs [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 33,024.0   29,594.6 25,186.3
Additions 3,275.8   3,710.4 4,601.9
Disposals or retirements (60.5)   (260.9) (186.7)
Effect of exchange rate changes (0.3)   (20.1) (6.9)
Ending balance 36,239.0   33,024.0 29,594.6
Software and system design costs [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 26,502.1   23,023.7 20,376.7
Additions 3,669.2   3,747.3 2,835.3
Disposals or retirements (59.9)   (258.6) (186.6)
Effect of exchange rate changes 0.3   (10.3) (1.7)
Ending balance 30,111.7   26,502.1 23,023.7
Patent and others [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 2,406.5   2,417.2  
Ending balance 4,268.7   2,406.5 2,417.2
Patent and others [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 8,302.9   7,656.3 5,716.0
Additions 2,974.8   647.8 1,969.4
Disposals or retirements       (31.2)
Effect of exchange rate changes (0.1)   (1.2) 2.1
Ending balance 11,277.6   8,302.9 7,656.3
Patent and others [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 5,896.4   5,239.1 4,747.5
Additions 1,112.5   658.2 522.5
Disposals or retirements       (31.2)
Effect of exchange rate changes     (0.9) 0.3
Ending balance $ 7,008.9   $ 5,896.4 $ 5,239.1