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Intangible Assets - Summary of Intangible Assets (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
TWD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
TWD ($)
Dec. 31, 2016
TWD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance $ 14,175.2   $ 14,614.8  
Impairment     13.5  
Ending balance 17,002.1 $ 555.4 14,175.2 $ 14,614.8
Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 46,994.3   43,184.0 38,912.5
Additions 7,105.0   4,268.2 4,399.1
Retirements     (75.2) (5.2)
Disposals or retirements (217.9)      
Reclassification     (10.3)  
Effect of disposal of subsidiary     (21.2)  
Effect of exchange rate changes 139.5   (351.2) (122.4)
Ending balance 54,020.9   46,994.3 43,184.0
Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 32,819.1   28,569.2 24,846.6
Additions 4,421.4   4,346.7 3,743.4
Retirements     (75.2) (5.2)
Disposals or retirements (217.8)      
Reclassification     (9.7)  
Impairment     13.5  
Effect of disposal of subsidiary     (21.1)  
Effect of exchange rate changes (3.9)   (4.3) (15.6)
Ending balance 37,018.8   32,819.1 28,569.2
Goodwill [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 5,648.7   6,008.0  
Ending balance 5,795.5   5,648.7 6,008.0
Goodwill [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 5,648.7   6,008.0 6,104.8
Effect of disposal of subsidiary     (13.5)  
Effect of exchange rate changes 146.8   (345.8) (96.8)
Ending balance 5,795.5   5,648.7 6,008.0
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 2,748.4   3,398.8  
Ending balance 2,218.5   2,748.4 3,398.8
Technology license fees [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 10,443.3   9,546.0 8,454.3
Additions 533.7   897.9 1,091.3
Effect of exchange rate changes (2.5)   (0.6) 0.4
Ending balance 10,974.5   10,443.3 9,546.0
Technology license fees [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 7,694.9   6,147.2 4,779.4
Additions 1,063.6   1,548.3 1,367.4
Effect of exchange rate changes (2.5)   (0.6) 0.4
Ending balance 8,756.0   7,694.9 6,147.2
Software and system design costs [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 4,809.6   4,099.1  
Ending balance 6,570.9   4,809.6 4,099.1
Software and system design costs [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 25,186.3   22,243.6 19,474.4
Additions 4,601.9   3,021.1 2,788.5
Retirements     (75.2) (5.2)
Disposals or retirements (186.7)      
Reclassification     7.7  
Effect of disposal of subsidiary     (7.7)  
Effect of exchange rate changes (6.9)   (3.2) (14.1)
Ending balance 29,594.6   25,186.3 22,243.6
Software and system design costs [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 20,376.7   18,144.5 16,431.6
Additions 2,835.3   2,310.7 1,730.8
Retirements     (75.2) (5.2)
Disposals or retirements (186.6)      
Reclassification     7.4  
Effect of disposal of subsidiary     (7.6)  
Effect of exchange rate changes (1.7)   (3.1) (12.7)
Ending balance 23,023.7   20,376.7 18,144.5
Patent and others [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 968.5   1,108.9  
Ending balance 2,417.2   968.5 1,108.9
Patent and others [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 5,716.0   5,386.4 4,879.0
Additions 1,969.4   349.2 519.3
Disposals or retirements (31.2)      
Reclassification     (18.0)  
Effect of exchange rate changes 2.1   (1.6) (11.9)
Ending balance 7,656.3   5,716.0 5,386.4
Patent and others [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 4,747.5   4,277.5 3,635.6
Additions 522.5   487.7 645.2
Disposals or retirements (31.2)      
Reclassification     (17.1)  
Effect of exchange rate changes 0.3   (0.6) (3.3)
Ending balance $ 5,239.1   $ 4,747.5 $ 4,277.5