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Net Income - Employee Benefit Expenses (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2018 TWD ($)
Disclosure Of Employee Benefit Expenses [Line Items] |  |  |  |
Defined contribution plans | $ 708 |  | $ 654 | $ 640
Defined benefit plans pension costs recognized in profit and loss | 2,001 |  | 2,859 | 2,953
Post-employment benefit | 2,709 |  | 3,513 | 3,593
Compensation cost of share-based payment transactions | 8 | $ 0 | 2 | 17
Salaries | 26,630 |  | 25,464 | 26,204
Insurance | 2,712 |  | 2,746 | 2,740
Others | 12,904 |  | 14,430 | 14,470
Other employee benefit | 42,246 |  | 42,640 | 43,414
Employee benefit expenses | 44,963 |  | 46,155 | 47,024
Summary by functions |  |  |  |
Compensation distributed to the employees |  |  | 1,126 | 1,404
Remuneration paid to the directors |  |  | 35 | 38
Operating costs [Member] |  |  |  |
Disclosure Of Employee Benefit Expenses [Line Items] |  |  |  |
Defined benefit plans pension costs recognized in profit and loss | 1,205 |  | 1,726 | 1,796
Employee benefit expenses | 23,005 |  | 23,587 | 24,367
Operating expenses [Member] |  |  |  |
Disclosure Of Employee Benefit Expenses [Line Items] |  |  |  |
Employee benefit expenses | $ 21,958 |  | $ 22,568 | $ 22,657

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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 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_102&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_99&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_104&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of expense from employee benefits (other than termination benefits), which 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, that the entity does not separately disclose in the same statement or note. [Refer: Employee benefits expense] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 9 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_9&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 53 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_53&doctype=Standard -URIDate 2020-01-01 + Details
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