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Intangible Assets - Summary of Intangible Assets (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | $ 22,766.7 |  | $ 25,999.2 |
Ending balance | 26,282.5 | $ 801.5 | 22,766.7 | $ 25,999.2
Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 93,682.2 |  | 91,928.5 | 84,061.4
Additions | 12,522.2 |  | 6,029.8 | 7,535.1
Disposals or retirements | (5,478.4) |  | (4,289.2) | (96.3)
Effect of exchange rate changes | 323.9 |  | 13.1 | 428.3
Ending balance | 101,049.9 |  | 93,682.2 | 91,928.5
Accumulated amortization and impairment [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 70,915.5 |  | 65,929.3 | 57,239.7
Additions | 9,186.1 |  | 9,258.2 | 8,756.1
Disposals or retirements | (5,369.8) |  | (4,289.1) | (77.7)
Effect of exchange rate changes | 35.6 |  | 17.1 | 11.2
Ending balance | 74,767.4 |  | 70,915.5 | 65,929.3
Goodwill [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 5,796.4 |  | 5,791.8 |
Ending balance | 6,070.9 |  | 5,796.4 | 5,791.8
Goodwill [member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 5,796.4 |  | 5,791.8 | 5,379.2
Effect of exchange rate changes | 274.5 |  | 4.6 | 412.6
Ending balance | 6,070.9 |  | 5,796.4 | 5,791.8
Technology license fees [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 5,731.3 |  | 8,062.6 |
Ending balance | 5,379.7 |  | 5,731.3 | 8,062.6
Technology license fees [member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 26,221.4 |  | 25,759.0 | 23,534.0
Additions | 2,378.4 |  | 461.1 | 2,253.0
Disposals or retirements | (32.5) |  | 0.0 | (30.0)
Effect of exchange rate changes | (0.8) |  | 1.3 | 2.0
Ending balance | 28,566.5 |  | 26,221.4 | 25,759.0
Technology license fees [member] | Accumulated amortization and impairment [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 20,490.1 |  | 17,696.4 | 14,912.4
Additions | 2,730.0 |  | 2,792.4 | 2,793.5
Disposals or retirements | (32.5) |  | 0.0 | (11.4)
Effect of exchange rate changes | (0.8) |  | 1.3 | 1.9
Ending balance | 23,186.8 |  | 20,490.1 | 17,696.4
Software and system design costs [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 9,470.3 |  | 9,837.4 |
Ending balance | 13,178.4 |  | 9,470.3 | 9,837.4
Software and system design costs [member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 49,317.0 |  | 48,675.8 | 43,651.0
Additions | 9,166.4 |  | 4,947.4 | 5,079.0
Disposals or retirements | (5,235.3) |  | (4,289.2) | (66.3)
Effect of exchange rate changes | 31.0 |  | (17.0) | 12.1
Ending balance | 53,279.1 |  | 49,317.0 | 48,675.8
Software and system design costs [member] | Accumulated amortization and impairment [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 39,846.7 |  | 38,838.4 | 34,121.6
Additions | 5,470.2 |  | 5,308.1 | 4,774.5
Disposals or retirements | (5,235.3) |  | (4,289.1) | (66.3)
Effect of exchange rate changes | 19.1 |  | (10.7) | 8.6
Ending balance | 40,100.7 |  | 39,846.7 | 38,838.4
Patent and others [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 1,768.7 |  | 2,307.4 |
Ending balance | 1,653.5 |  | 1,768.7 | 2,307.4
Patent and others [member] | Cost [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 12,347.4 |  | 11,701.9 | 11,497.2
Additions | 977.4 |  | 621.3 | 203.1
Disposals or retirements | (210.6) |  |  |
Effect of exchange rate changes | 19.2 |  | 24.2 | 1.6
Ending balance | 13,133.4 |  | 12,347.4 | 11,701.9
Patent and others [member] | Accumulated amortization and impairment [member] |  |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |  |
Beginning balance | 10,578.7 |  | 9,394.5 | 8,205.7
Additions | 985.9 |  | 1,157.7 | 1,188.1
Disposals or retirements | (102.0) |  |  |
Effect of exchange rate changes | 17.3 |  | 26.5 | 0.7
Ending balance | $ 11,479.9 |  | $ 10,578.7 | $ 9,394.5

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