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Intangible Assets - Summary of Intangible Assets (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2019
TWD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance $ 25,768.1   $ 20,653.0  
Ending balance 26,821.7 $ 966.9 25,768.1 $ 20,653.0
Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 75,114.9   62,875.3 54,020.9
Additions 9,318.5   12,559.5 9,237.8
Disposals or retirements (318.7)   (60.5) (260.9)
Effect of exchange rate changes (53.3)   (259.4) (122.5)
Ending balance 84,061.4   75,114.9 62,875.3
Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 49,346.8   42,222.3 37,018.8
Additions 8,207.2   7,186.2 5,472.4
Disposals or retirements (317.5)   (59.9) (258.6)
Effect of exchange rate changes 3.2   (1.8) (10.3)
Ending balance 57,239.7   49,346.8 42,222.3
Goodwill [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 5,436.6   5,693.4  
Ending balance 5,379.2   5,436.6 5,693.4
Goodwill [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 5,436.6   5,693.4 5,795.5
Effect of exchange rate changes (57.4)   (256.8) (102.1)
Ending balance 5,379.2   5,436.6 5,693.4
Technology license fees [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 9,935.5   6,031.2  
Ending balance 8,621.6   9,935.5 6,031.2
Technology license fees [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 22,161.7   15,855.0 10,974.5
Additions 1,372.8   6,308.9 4,879.6
Effect of exchange rate changes (0.5)   (2.2) 0.9
Ending balance 23,534.0   22,161.7 15,855.0
Technology license fees [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 12,226.2   9,823.8 8,756.0
Additions 2,686.8   2,404.5 1,066.9
Effect of exchange rate changes (0.6)   (2.1) 0.9
Ending balance 14,912.4   12,226.2 9,823.8
Software and system design costs [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 6,127.3   6,521.9  
Ending balance 9,529.4   6,127.3 6,521.9
Software and system design costs [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 36,239.0   33,024.0 29,594.6
Additions 7,726.2   3,275.8 3,710.4
Disposals or retirements (318.7)   (60.5) (260.9)
Effect of exchange rate changes 4.5   (0.3) (20.1)
Ending balance 43,651.0   36,239.0 33,024.0
Software and system design costs [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 30,111.7   26,502.1 23,023.7
Additions 4,323.9   3,669.2 3,747.3
Disposals or retirements (317.5)   (59.9) (258.6)
Effect of exchange rate changes 3.5   0.3 (10.3)
Ending balance 34,121.6   30,111.7 26,502.1
Patent and others [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 4,268.7   2,406.5  
Ending balance 3,291.5   4,268.7 2,406.5
Patent and others [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 11,277.6   8,302.9 7,656.3
Additions 219.5   2,974.8 647.8
Effect of exchange rate changes 0.1   (0.1) (1.2)
Ending balance 11,497.2   11,277.6 8,302.9
Patent and others [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 7,008.9   5,896.4 5,239.1
Additions 1,196.5   1,112.5 658.2
Effect of exchange rate changes 0.3     (0.9)
Ending balance $ 8,205.7   $ 7,008.9 $ 5,896.4