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Intangible Assets - Summary of Intangible Assets (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
TWD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
TWD ($)
Dec. 31, 2015
TWD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance $ 14,614.8   $ 14,065.9  
Impairment 13.5 $ 0.5   $ 58.5
Ending balance 14,175.2 $ 478.2 14,614.8 14,065.9
Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 43,184.0   38,912.5 35,228.7
Additions 4,268.2   4,399.1 3,568.1
Retirements (75.2)   (5.2) (101.4)
Reclassification (10.3)      
Effect of acquisition of subsidiary       64.8
Effect of disposal of subsidiary (21.2)      
Effect of exchange rate changes (351.2)   (122.4) 152.3
Ending balance 46,994.3   43,184.0 38,912.5
Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 28,569.2   24,846.6 21,697.2
Additions 4,346.7   3,743.4 3,202.2
Retirements (75.2)   (5.2) (101.4)
Reclassification (9.7)      
Impairment 13.5     58.5
Effect of disposal of subsidiary (21.1)      
Effect of exchange rate changes (4.3)   (15.6) (9.9)
Ending balance 32,819.1   28,569.2 24,846.6
Goodwill [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 6,008.0   6,104.8  
Ending balance 5,648.7   6,008.0 6,104.8
Goodwill [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 6,008.0   6,104.8 5,888.8
Effect of acquisition of subsidiary       52.7
Effect of disposal of subsidiary (13.5)      
Effect of exchange rate changes (345.8)   (96.8) 163.3
Ending balance 5,648.7   6,008.0 6,104.8
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 3,398.8   3,674.9  
Ending balance 2,748.4   3,398.8 3,674.9
Technology license fees [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 9,546.0   8,454.3 6,350.3
Additions 897.9   1,091.3 2,112.5
Effect of exchange rate changes (0.6)   0.4 (8.5)
Ending balance 10,443.3   9,546.0 8,454.3
Technology license fees [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 6,147.2   4,779.4 3,778.9
Additions 1,548.3   1,367.4 950.9
Impairment       58.1
Effect of exchange rate changes (0.6)   0.4 (8.5)
Ending balance 7,694.9   6,147.2 4,779.4
Software and system design costs [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 4,099.1   3,042.8  
Ending balance 4,809.6   4,099.1 3,042.8
Software and system design costs [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 22,243.6   19,474.4 18,697.1
Additions 3,021.1   2,788.5 867.8
Retirements (75.2)   (5.2) (101.4)
Reclassification 7.7      
Effect of acquisition of subsidiary       12.1
Effect of disposal of subsidiary (7.7)      
Effect of exchange rate changes (3.2)   (14.1) (1.2)
Ending balance 25,186.3   22,243.6 19,474.4
Software and system design costs [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 18,144.5   16,431.6 14,861.1
Additions 2,310.7   1,730.8 1,672.6
Retirements (75.2)   (5.2) (101.4)
Reclassification 7.4      
Impairment       0.4
Effect of disposal of subsidiary (7.6)      
Effect of exchange rate changes (3.1)   (12.7) (1.1)
Ending balance 20,376.7   18,144.5 16,431.6
Patent and others [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 1,108.9   1,243.4  
Ending balance 968.5   1,108.9 1,243.4
Patent and others [member] | Cost [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 5,386.4   4,879.0 4,292.5
Additions 349.2   519.3 587.8
Reclassification (18.0)      
Effect of exchange rate changes (1.6)   (11.9) (1.3)
Ending balance 5,716.0   5,386.4 4,879.0
Patent and others [member] | Accumulated amortization [member]        
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]        
Beginning balance 4,277.5   3,635.6 3,057.2
Additions 487.7   645.2 578.7
Reclassification (17.1)      
Effect of exchange rate changes (0.6)   (3.3) (0.3)
Ending balance $ 4,747.5   $ 4,277.5 $ 3,635.6