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Subsidiaries - Less Than Wholly Owned Subsidiaries of the Company That Have Material Noncontrolling Interests (Detail) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2024 USD ($)
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Profit attributable to noncontrolling interests | $ 1,319 | $ 40 | $ 1,103 | $ 1,511 |
Accumulated Noncontrolling Interests | $ 12,980 |  | $ 12,432 |  | $ 396
Senao International Co., Ltd. (SENAO) [Member] |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Place of Incorporation | Taiwan | Taiwan |  |  |
Principal Place of Business | Taiwan | Taiwan |  |  |
Proportion of Ownership Interests Held by Noncontrolling Interests | 72.00% | 72.00% | 72.00% |  |
Proportion of Voting Rights Held by Noncontrolling Interests | 72.00% | 72.00% | 72.00% |  |
Profit attributable to noncontrolling interests | $ 353 |  | $ 510 | 462 |
Accumulated Noncontrolling Interests | $ 4,549 |  | $ 4,533 |  |
Chunghwa Precision Test Tech. Co., Ltd. (CHPT) [Member] |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Place of Incorporation | Taiwan | Taiwan |  |  |
Principal Place of Business | Taiwan | Taiwan |  |  |
Proportion of Ownership Interests Held by Noncontrolling Interests | 66.00% | 66.00% | 66.00% |  |
Proportion of Voting Rights Held by Noncontrolling Interests | 66.00% | 66.00% | 66.00% |  |
Profit attributable to noncontrolling interests | $ 295 |  | $ 15 | $ 496 |
Accumulated Noncontrolling Interests | 5,289 |  | 4,994 |  |
Individually immaterial subsidiaries with noncontrolling interests [Member] |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |
Accumulated Noncontrolling Interests | $ 3,142 |  | $ 2,905 |  |

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- Definition The amount of equity in a subsidiary not attributable, directly or indirectly, to a parent. [Refer: Total for all subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 10 -IssueDate 2024-01-01 -Paragraph 22 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=10&code=ifrs-tx-2024-en-r&anchor=para_22&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph 12 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_12_f&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph q -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_q&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The profit (loss) from continuing and discontinued operations attributable to non-controlling interests. [Refer: Profit (loss); Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph 12 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_12_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 81B -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_81B_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The proportion of the voting rights in a subsidiary held by non-controlling interests. [Refer: Total for all subsidiaries [member]; Non-controlling interests] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph 12 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_12_d&doctype=Standard -URIDate 2024-03-27 + Details
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