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v3.20.1

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

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