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Intangible Assets - Summary of Intangible Assets (Detail)
$ in Millions, $ in Millions
 6 Months Ended
Jun. 30, 2021
TWD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
TWD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance $ 25,768.1   $ 20,653.0
Ending balance 26,535.1 $ 950.7 27,395.6
Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 75,114.9   62,875.3
Additions 4,803.9   10,190.3
Disposals or retirements (13.8)   (48.8)
Effect of exchange rate changes (24.8)   (97.9)
Ending balance 79,880.2   72,918.9
Accumulated amortization [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 49,346.8   42,222.3
Additions 4,008.4   3,364.4
Disposals or retirements (12.6)   (48.8)
Effect of exchange rate changes 2.5   (14.6)
Ending balance 53,345.1   45,523.3
Goodwill [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 5,436.6   5,693.4
Ending balance 5,408.4   5,617.5
Goodwill [member] | Cost [member]      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Beginning balance 5,436.6   5,693.4
Effect of exchange rate changes (28.2)   (75.9)
Ending balance 5,408.4   5,617.5
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 9,606.4   11,044.4
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
Additions 1,005.0   6,035.2
Effect of exchange rate changes 1.1   (3.4)
Ending balance 23,167.8   21,886.8
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
Additions 1,334.1   1,021.9
Effect of exchange rate changes 1.1   (3.3)
Ending balance 13,561.4   10,842.4
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 7,766.6   5,950.7
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
Additions 3,708.2   1,292.0
Disposals or retirements (13.8)   (48.8)
Effect of exchange rate changes 2.1   (17.3)
Ending balance 39,935.5   34,249.9
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
Additions 2,068.5   1,856.2
Disposals or retirements (12.6)   (48.8)
Effect of exchange rate changes 1.3   (10.3)
Ending balance 32,168.9   28,299.2
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 3,753.7   4,783.0
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
Additions 90.7   2,863.1
Effect of exchange rate changes 0.2   (1.3)
Ending balance 11,368.5   11,164.7
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
Additions 605.8   486.3
Effect of exchange rate changes 0.1   (1.0)
Ending balance $ 7,614.8   $ 6,381.7