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v3.19.1

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

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