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Intangible Assets - Additional Information (Detail) - TWD ($) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Certain licensed contract [Member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Impairment loss | $ 0 | $ 0 |
Senao Networks, Inc. ("SNI") [Member] | Certain licensed contract [Member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Impairment loss |  |  | $ 9,000,000
Asia Pacific Telecom Co., Ltd [Member] | Intangible Assets- Mobile Broadband Concession and Other Assets- Spare Parts [Member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Tax-excluded transaction amount | $ 1,800,000,000 |  |
Bottom of range [Member] | Computer software [Member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Estimated useful lives | 1 year |  |
Bottom of range [Member] | Others [Member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Estimated useful lives | 3 years |  |
Top of Range [Member] | Computer software [Member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Estimated useful lives | 10 years |  |
Top of Range [Member] | Others [Member] |  |  |
Disclosure of detailed information about intangible assets [Line Items] |  |  |
Estimated useful lives | 20 years |  |

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- Definition The increase in intangible assets other than goodwill resulting from acquisitions through business combinations. [Refer: Total for all business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2024-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_e_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of impairment loss recognised in profit or loss. [Refer: Impairment loss; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 126 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_126_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2024-01-01 -Paragraph 129 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2024-en-r&anchor=para_129_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The useful life, measured as period of time, used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2024-01-01 -Paragraph 118 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_118_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Details
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