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Subsidiaries - Additional Information (Detail) $ in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
Disclosure of subsidiaries [Line Items] |  |  |  |
Revenue | $ 223,199 | $ 7,289 | $ 216,739 | $ 210,478
Net income | $ 38,061 | $ 1,243 | $ 37,869 | $ 37,047
International Integrated Systems, Inc. ("IISI") [Member] |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |
Equity ownership percentage | 51.00% | 51.00% | 51.00% |
Chunghwa Leading Photonics Tech Co., Ltd. ("CLPT") [Member] |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |
Equity ownership percentage | 74.56% | 74.56% | 75.00% |
Chunghwa Telecom Co., Ltd. and Chunghwa Investment Co., Ltd. [Member] | CHIEF Telecom Inc. (CHIEF) [Member] |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |
Equity ownership percentage | 58.63% | 58.63% | 58.67% |
Chunghwa Telecom Co., Ltd. and Chunghwa Investment Co., Ltd. [Member] | CHT Security Co., Ltd. (CHTSC) [Member] |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |
Equity ownership percentage | 69.28% | 69.28% | 73.09% |
Chunghwa Telecom Co., Ltd. and Chunghwa Investment Co., Ltd. [Member] | IISI Plan [Member] |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |
Equity ownership percentage | 51.02% | 51.02% |  |
Chunghwa Telecom Co., Ltd. and Chunghwa Investment Co., Ltd. [Member] | Chunghwa Leading Photonics Tech Co., Ltd. ("CLPT") [Member] |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |
Equity ownership percentage | 74.56% | 74.56% |  |

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- Definition The total of income less expenses from continuing and discontinued operations, excluding the components of other comprehensive income. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 18 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_18_b&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2023-01-01 -Paragraph 32 -Subparagraph a -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2023-en-r&anchor=para_32_a_ii&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 1 -IssueDate 2023-01-01 -Paragraph 24 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=1&code=ifrs-tx-2023-en-r&anchor=para_24_b&doctype=Standard -URIDate 2023-03-23 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2023-01-01 -Paragraph 28 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_28_b&doctype=Standard -URIDate 2023-03-23 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2023-01-01 -Paragraph 23 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2023-en-r&anchor=para_23&doctype=Standard -URIDate 2023-03-23 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph B10 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_B10_b&doctype=Appendix&subtype=B -URIDate 2023-03-23 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 17 -IssueDate 2023-01-01 -Paragraph 113 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=17&code=ifrs-tx-2023-en-r&anchor=para_113_b&doctype=Standard -URIDate 2023-03-23 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 81A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_81A_a&doctype=Standard -URIDate 2023-03-23 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 106 -Subparagraph d -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_106_d_i&doctype=Standard -URIDate 2023-03-23 + Details
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