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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

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