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Net Income - Employee Benefit Expenses (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($)
Disclosure Of Employee Benefit Expenses [Line Items] |  |  |  |
Defined contribution plans | $ 1,074 |  | $ 963 | $ 862
Defined benefit plans pension costs recognized in profit and loss | 835 |  | 935 | 1,048
Post-employment benefit | 1,909 |  | 1,898 | 1,910
Compensation cost of share-based payment transactions | 8 | $ 0 | 8 | 16
Other employee benefit (Note) | 46,964 |  | 44,305 | 43,746
Employee benefit expenses | 48,881 |  | 46,211 | 45,672
Summary by functions |  |  |  |
Compensation distributed to the employees |  |  | 1,522 | 1,498
Remuneration paid to the directors |  |  | 40 | 39
Operating costs [Member] |  |  |  |
Disclosure Of Employee Benefit Expenses [Line Items] |  |  |  |
Defined benefit plans pension costs recognized in profit and loss | 416 |  | 488 | 565
Employee benefit expenses | 22,796 |  | 21,858 | 21,857
Operating expenses [Member] |  |  |  |
Disclosure Of Employee Benefit Expenses [Line Items] |  |  |  |
Employee benefit expenses | $ 26,085 |  | $ 24,353 | $ 23,815

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- Definition The amount of remuneration paid or payable to the entity's directors. + 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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- Definition The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions] + 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 long-term employee benefits other than post-employment benefits and termination benefits. Such benefits may include long-term paid absences, jubilee or other long-service benefits, long-term disability benefits, long-term profit-sharing and bonuses and long-term deferred remuneration. [Refer: Employee benefits expense] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 158 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_158&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of post-employment benefit expense included in profit or loss relating to defined benefit plans. [Refer: Profit (loss); Defined benefit plans [domain]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 5 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_5&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_135_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 53 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_53&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of expense from employee benefits (other than termination benefits) that are expected to be settled wholly within twelve months after the end of the annual reporting period in which the employees render the related services. + 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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