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Intangible Assets - Summary of Intangible Assets (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | $ 25,768.1 |  | $ 20,653.0 |
Ending balance | 26,821.7 | $ 966.9 | 25,768.1 | $ 20,653.0
Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 75,114.9 |  | 62,875.3 | 54,020.9
Additions | 9,318.5 |  | 12,559.5 | 9,237.8
Disposals or retirements | (318.7) |  | (60.5) | (260.9)
Effect of exchange rate changes | (53.3) |  | (259.4) | (122.5)
Ending balance | 84,061.4 |  | 75,114.9 | 62,875.3
Accumulated amortization [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 49,346.8 |  | 42,222.3 | 37,018.8
Additions | 8,207.2 |  | 7,186.2 | 5,472.4
Disposals or retirements | (317.5) |  | (59.9) | (258.6)
Effect of exchange rate changes | 3.2 |  | (1.8) | (10.3)
Ending balance | 57,239.7 |  | 49,346.8 | 42,222.3
Goodwill [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 5,436.6 |  | 5,693.4 |
Ending balance | 5,379.2 |  | 5,436.6 | 5,693.4
Goodwill [member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 5,436.6 |  | 5,693.4 | 5,795.5
Effect of exchange rate changes | (57.4) |  | (256.8) | (102.1)
Ending balance | 5,379.2 |  | 5,436.6 | 5,693.4
Technology license fees [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 9,935.5 |  | 6,031.2 |
Ending balance | 8,621.6 |  | 9,935.5 | 6,031.2
Technology license fees [member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 22,161.7 |  | 15,855.0 | 10,974.5
Additions | 1,372.8 |  | 6,308.9 | 4,879.6
Effect of exchange rate changes | (0.5) |  | (2.2) | 0.9
Ending balance | 23,534.0 |  | 22,161.7 | 15,855.0
Technology license fees [member] | Accumulated amortization [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 12,226.2 |  | 9,823.8 | 8,756.0
Additions | 2,686.8 |  | 2,404.5 | 1,066.9
Effect of exchange rate changes | (0.6) |  | (2.1) | 0.9
Ending balance | 14,912.4 |  | 12,226.2 | 9,823.8
Software and system design costs [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 6,127.3 |  | 6,521.9 |
Ending balance | 9,529.4 |  | 6,127.3 | 6,521.9
Software and system design costs [member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 36,239.0 |  | 33,024.0 | 29,594.6
Additions | 7,726.2 |  | 3,275.8 | 3,710.4
Disposals or retirements | (318.7) |  | (60.5) | (260.9)
Effect of exchange rate changes | 4.5 |  | (0.3) | (20.1)
Ending balance | 43,651.0 |  | 36,239.0 | 33,024.0
Software and system design costs [member] | Accumulated amortization [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 30,111.7 |  | 26,502.1 | 23,023.7
Additions | 4,323.9 |  | 3,669.2 | 3,747.3
Disposals or retirements | (317.5) |  | (59.9) | (258.6)
Effect of exchange rate changes | 3.5 |  | 0.3 | (10.3)
Ending balance | 34,121.6 |  | 30,111.7 | 26,502.1
Patent and others [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 4,268.7 |  | 2,406.5 |
Ending balance | 3,291.5 |  | 4,268.7 | 2,406.5
Patent and others [member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 11,277.6 |  | 8,302.9 | 7,656.3
Additions | 219.5 |  | 2,974.8 | 647.8
Effect of exchange rate changes | 0.1 |  | (0.1) | (1.2)
Ending balance | 11,497.2 |  | 11,277.6 | 8,302.9
Patent and others [member] | Accumulated amortization [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 7,008.9 |  | 5,896.4 | 5,239.1
Additions | 1,196.5 |  | 1,112.5 | 658.2
Effect of exchange rate changes | 0.3 |  |  | (0.9)
Ending balance | $ 8,205.7 |  | $ 7,008.9 | $ 5,896.4

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