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Intangible Assets - Summary of Intangible Assets (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2020 TWD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | $ 26,821.7 |  | $ 25,768.1 |
Ending balance | 25,999.2 | $ 846.1 | 26,821.7 | $ 25,768.1
Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 84,061.4 |  | 75,114.9 | 62,875.3
Additions | 7,535.1 |  | 9,318.5 | 12,559.5
Disposals or retirements | (96.3) |  | (318.7) | (60.5)
Effect of exchange rate changes | 428.3 |  | (53.3) | (259.4)
Ending balance | 91,928.5 |  | 84,061.4 | 75,114.9
Accumulated amortization [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 57,239.7 |  | 49,346.8 | 42,222.3
Additions | 8,756.1 |  | 8,207.2 | 7,186.2
Disposals or retirements | (77.7) |  | (317.5) | (59.9)
Effect of exchange rate changes | 11.2 |  | 3.2 | (1.8)
Ending balance | 65,929.3 |  | 57,239.7 | 49,346.8
Goodwill [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 5,379.2 |  | 5,436.6 |
Ending balance | 5,791.8 |  | 5,379.2 | 5,436.6
Goodwill [member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 5,379.2 |  | 5,436.6 | 5,693.4
Effect of exchange rate changes | 412.6 |  | (57.4) | (256.8)
Ending balance | 5,791.8 |  | 5,379.2 | 5,436.6
Technology license fees [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 8,621.6 |  | 9,935.5 |
Ending balance | 8,062.6 |  | 8,621.6 | 9,935.5
Technology license fees [member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 23,534.0 |  | 22,161.7 | 15,855.0
Additions | 2,253.0 |  | 1,372.8 | 6,308.9
Disposals or retirements | (30.0) |  |  |
Effect of exchange rate changes | 2.0 |  | (0.5) | (2.2)
Ending balance | 25,759.0 |  | 23,534.0 | 22,161.7
Technology license fees [member] | Accumulated amortization [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 14,912.4 |  | 12,226.2 | 9,823.8
Additions | 2,793.5 |  | 2,686.8 | 2,404.5
Disposals or retirements | (11.4) |  |  |
Effect of exchange rate changes | 1.9 |  | (0.6) | (2.1)
Ending balance | 17,696.4 |  | 14,912.4 | 12,226.2
Software and system design costs [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 9,529.4 |  | 6,127.3 |
Ending balance | 9,837.4 |  | 9,529.4 | 6,127.3
Software and system design costs [member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 43,651.0 |  | 36,239.0 | 33,024.0
Additions | 5,079.0 |  | 7,726.2 | 3,275.8
Disposals or retirements | (66.3) |  | (318.7) | (60.5)
Effect of exchange rate changes | 12.1 |  | 4.5 | (0.3)
Ending balance | 48,675.8 |  | 43,651.0 | 36,239.0
Software and system design costs [member] | Accumulated amortization [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 34,121.6 |  | 30,111.7 | 26,502.1
Additions | 4,774.5 |  | 4,323.9 | 3,669.2
Disposals or retirements | (66.3) |  | (317.5) | (59.9)
Effect of exchange rate changes | 8.6 |  | 3.5 | 0.3
Ending balance | 38,838.4 |  | 34,121.6 | 30,111.7
Patent and others [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 3,291.5 |  | 4,268.7 |
Ending balance | 2,307.4 |  | 3,291.5 | 4,268.7
Patent and others [member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 11,497.2 |  | 11,277.6 | 8,302.9
Additions | 203.1 |  | 219.5 | 2,974.8
Effect of exchange rate changes | 1.6 |  | 0.1 | (0.1)
Ending balance | 11,701.9 |  | 11,497.2 | 11,277.6
Patent and others [member] | Accumulated amortization [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 8,205.7 |  | 7,008.9 | 5,896.4
Additions | 1,188.1 |  | 1,196.5 | 1,112.5
Effect of exchange rate changes | 0.7 |  | 0.3 | 0.0
Ending balance | $ 9,394.5 |  | $ 8,205.7 | $ 7,008.9

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