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Additional Information of Expenses by Nature - Summary of Additional Information of Expenses by Nature (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Expense by nature [line items] |  |  |  |
Other operating income and expenses | $ (1,230.2) | $ (37.5) | $ 188.7 | $ (368.4)
Depreciation of property, plant and equipment and right-of-use assets | 653,610.5 | 19,933.2 | 522,932.7 | 428,498.2
Defined contribution plans | 5,932.2 |  | 5,365.5 | 4,550.4
Defined benefit plans | 275.7 |  | 281.4 | 208.6
Share -based payments | 1,646.2 |  | 544.4 | 335.1
Amortization of intangible assets | 9,186.1 | $ 280.2 | 9,258.2 | 8,756.1
Post-employment benefits | 6,207.9 |  | 5,646.9 | 4,759.0
Depreciation of property, plant and equipment and right-of-use assets [member] |  |  |  |
Expense by nature [line items] |  |  |  |
Cost of revenue | 616,390.4 |  | 492,827.4 | 399,638.8
Operating expenses | 37,190.4 |  | 30,097.8 | 28,850.5
Other operating income and expenses | 29.7 |  | 7.5 | 8.9
Amortization of intangible assets [member] |  |  |  |
Expense by nature [line items] |  |  |  |
Cost of revenue | 6,342.3 |  | 6,538.1 | 6,086.3
Operating expenses | 2,843.8 |  | 2,720.1 | 2,669.8
Employee benefits expenses [member] |  |  |  |
Expense by nature [line items] |  |  |  |
Cost of revenue | 163,657.1 |  | 133,334.7 | 139,361.4
Operating expenses | 138,165.0 |  | 106,373.9 | 100,100.6
Defined contribution plans | 5,932.2 |  | 5,365.5 | 4,550.4
Defined benefit plans | 275.7 |  | 281.4 | 208.6
Equity-settled | 1,242.7 |  | 483.0 | 302.4
Cash-settled | 403.5 |  | 61.4 | 32.7
Other employee benefits | 293,968.0 |  | 233,517.3 | 234,367.9
Employee benefits expenses | $ 301,822.1 |  | $ 239,708.6 | $ 239,462.0

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- Definition The amount of amortisation expense. Amortisation is the systematic allocation of depreciable amounts of intangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of depreciation expense. Depreciation is the systematic allocation of depreciable amounts of tangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 102 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_102&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 99 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_99&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 104 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_104&doctype=Standard -URIDate 2024-03-27 + Details
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