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Intangible Assets - Summary of Intangible Assets (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
TWD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
TWD ($)
Dec. 31, 2017
TWD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance $ 17,002.1   $ 14,175.2  
Impairment       $ 13.5
Ending balance 20,653.0 $ 690.5 17,002.1 14,175.2
Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 54,020.9   46,994.3 43,184.0
Additions 9,237.8   7,105.0 4,268.2
Retirements       (75.2)
Disposals or retirements (260.9)   (217.9)  
Reclassification       (10.3)
Effect of disposal of subsidiary       (21.2)
Effect of exchange rate changes (122.5)   139.5 (351.2)
Ending balance 62,875.3   54,020.9 46,994.3
Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 37,018.8   32,819.1 28,569.2
Additions 5,472.4   4,421.4 4,346.7
Retirements       (75.2)
Disposals or retirements (258.6)   (217.8)  
Reclassification       (9.7)
Impairment       13.5
Effect of disposal of subsidiary       (21.1)
Effect of exchange rate changes (10.3)   (3.9) (4.3)
Ending balance 42,222.3   37,018.8 32,819.1
Goodwill [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 5,795.5   5,648.7  
Ending balance 5,693.4   5,795.5 5,648.7
Goodwill [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 5,795.5   5,648.7 6,008.0
Effect of disposal of subsidiary       (13.5)
Effect of exchange rate changes (102.1)   146.8 (345.8)
Ending balance 5,693.4   5,795.5 5,648.7
Goodwill [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Impairment       13.5
Effect of disposal of subsidiary       (13.5)
Technology license fees [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 2,218.5   2,748.4  
Ending balance 6,031.2   2,218.5 2,748.4
Technology license fees [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 10,974.5   10,443.3 9,546.0
Additions 4,879.6   533.7 897.9
Effect of exchange rate changes 0.9   (2.5) (0.6)
Ending balance 15,855.0   10,974.5 10,443.3
Technology license fees [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 8,756.0   7,694.9 6,147.2
Additions 1,066.9   1,063.6 1,548.3
Effect of exchange rate changes 0.9   (2.5) (0.6)
Ending balance 9,823.8   8,756.0 7,694.9
Software and system design costs [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 6,570.9   4,809.6  
Ending balance 6,521.9   6,570.9 4,809.6
Software and system design costs [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 29,594.6   25,186.3 22,243.6
Additions 3,710.4   4,601.9 3,021.1
Retirements       (75.2)
Disposals or retirements (260.9)   (186.7)  
Reclassification       7.7
Effect of disposal of subsidiary       (7.7)
Effect of exchange rate changes (20.1)   (6.9) (3.2)
Ending balance 33,024.0   29,594.6 25,186.3
Software and system design costs [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 23,023.7   20,376.7 18,144.5
Additions 3,747.3   2,835.3 2,310.7
Retirements       (75.2)
Disposals or retirements (258.6)   (186.6)  
Reclassification       7.4
Effect of disposal of subsidiary       (7.6)
Effect of exchange rate changes (10.3)   (1.7) (3.1)
Ending balance 26,502.1   23,023.7 20,376.7
Patent and others [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 2,417.2   968.5  
Ending balance 2,406.5   2,417.2 968.5
Patent and others [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 7,656.3   5,716.0 5,386.4
Additions 647.8   1,969.4 349.2
Disposals or retirements     (31.2)  
Reclassification       (18.0)
Effect of exchange rate changes (1.2)   2.1 (1.6)
Ending balance 8,302.9   7,656.3 5,716.0
Patent and others [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 5,239.1   4,747.5 4,277.5
Additions 658.2   522.5 487.7
Disposals or retirements     (31.2)  
Reclassification       (17.1)
Effect of exchange rate changes (0.9)   0.3 (0.6)
Ending balance $ 5,896.4   $ 5,239.1 $ 4,747.5