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Share-based Payments Arrangement - Additional Information (Detail) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |
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Sep. 26, 2023 $ / shares shares | May 31, 2022 $ / shares shares | Feb. 26, 2021 $ / shares shares | Feb. 20, 2021 $ / shares shares | Nov. 13, 2020 $ / shares shares | Dec. 20, 2019 $ / shares shares | Oct. 31, 2018 $ / shares shares | Dec. 19, 2017 $ / shares shares | Jan. 31, 2014 $ / shares shares | Dec. 31, 2023 TWD ($) $ / shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) $ / shares | Dec. 31, 2021 TWD ($) $ / shares | Sep. 30, 2023 $ / shares | Aug. 31, 2023 $ / shares | Jul. 31, 2022 $ / shares | Sep. 30, 2021 $ / shares | Dec. 31, 2020
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation costs |  |  |  |  |  |  |  |  |  | $ 8,000,000 | $ 0 | $ 16,000,000 | $ 19,000,000 |  |  |  |  |
CHIEF Telecom Inc. (CHIEF) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common share each option is eligible | shares |  |  |  |  | 1,000 |  | 1,000 | 1,000 |  |  |  |  |  |  |  |  |  |
Compensation costs | $ |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  | $ 8,800,000 | $ 10,000,000 |  |  |  |  |
CHIEF Telecom Inc. (CHIEF) [Member] | Granted on December 19, 2017 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option expire period |  |  |  |  |  |  |  |  |  | five years | five years |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  | two years | two years |  |  |  |  |  |  |
Outstanding stock options |  |  |  |  |  |  |  |  |  |  |  | 0 | 213.25 |  |  |  |  | 427.5
Exercise Price |  |  |  |  |  |  |  | $ 132.7 |  | $ 124.7 |  |  |  |  |  | $ 124.7 | $ 128.7 |
Exercise price |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 128.7 |  |  |  |  |
CHIEF Telecom Inc. (CHIEF) [Member] | Granted on October 31, 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option expire period |  |  |  |  |  |  |  |  |  | five years | five years |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  | two years | two years |  |  |  |  |  |  |
Outstanding stock options |  |  |  |  |  |  |  |  |  |  |  | 0 | 10.5 |  |  |  |  | 21
Exercise Price |  |  |  |  |  |  | $ 138.7 |  |  | $ 130.3 |  |  |  |  |  | 130.3 | 134.5 |
Exercise price |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |
CHIEF Telecom Inc. (CHIEF) [Member] | Granted on November 13, 2020 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option expire period |  |  |  |  |  |  |  |  |  | five years | five years |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  | two years | two years |  |  |  |  |  |  |
Outstanding stock options |  |  |  |  |  |  |  |  |  | 93 |  | 142.25 | 194 |  |  |  |  | 200
Exercise Price |  |  |  |  | $ 206 |  |  |  |  | $ 171.7 |  |  |  |  | $ 171.7 | $ 193.5 | 199.7 |
Exercise price |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 193.5 | $ 0 |  |  |  |  |
CHT Security Co., Ltd. (CHTSC) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common share each option is eligible | shares |  |  |  | 1,000 |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Compensation costs | $ |  |  |  |  |  |  |  |  |  | $ 500,000 |  | $ 5,100,000 | $ 8,400,000 |  |  |  |  |
CHT Security Co., Ltd. (CHTSC) [Member] | Granted on December 20, 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option expire period |  |  |  |  |  | five years |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | one year |  |  |  |  |  |  |  |  |  |  |  |
Outstanding stock options |  |  |  |  |  |  |  |  |  | 40 |  | 1,083 | 3,174 |  |  |  |  | 4,328
Exercise Price |  |  |  |  |  | $ 19.085 |  |  |  |  |  |  |  |  |  |  |  |
Shares issued | shares |  |  |  |  |  | 4,500 |  |  |  |  |  |  |  |  |  |  |  |
Exercise price |  |  |  |  |  |  |  |  |  | $ 19.085 |  | $ 19.085 | $ 19.085 |  |  |  |  |
CHT Security Co., Ltd. (CHTSC) [Member] | Granted on February 20, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option expire period |  |  |  | five years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  | one year |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding stock options |  |  |  |  |  |  |  |  |  | 1,519 |  | 2,343 | 3,324 |  |  |  |  | 0
Exercise Price |  |  |  | $ 19.085 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued | shares |  |  |  | 3,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price |  |  |  |  |  |  |  |  |  | $ 19.085 |  | $ 19.085 | $ 0 |  |  |  |  |
IISI Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common share each option is eligible | shares |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |
Option expire period |  |  |  |  |  |  |  |  |  | seven years | seven years |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  | two years | two years |  |  |  |  |  |  |
Compensation costs | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |
Exercise Price |  |  |  |  |  |  |  |  | $ 14 |  |  |  |  |  |  |  |  |
Shares issued | shares |  |  |  |  |  |  |  |  | 1,665 |  |  |  |  |  |  |  |  |
C L P T Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common share each option is eligible | shares | 1,000 | 1,000 | 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option expire period | four years | four years | four years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period | two years | two years | two years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation costs | $ |  |  |  |  |  |  |  |  |  | $ 2,900,000 |  | $ 1,500,000 | $ 900,000 |  |  |  |  |
Exercise Price | $ 16.87 | $ 16.87 | $ 16.87 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued | shares | 755 | 600 | 690 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
C L P T Plan | Granted on February 26, 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding stock options |  |  |  |  |  |  |  |  |  | 440 |  | 510 | 550 |  |  |  |  | 0
Exercise Price |  |  | $ 16.87 |  |  |  |  |  |  |  |  |  |  | $ 14.4 |  |  | $ 15.9 |
Exercise price |  |  |  |  |  |  |  |  |  | $ 14.4 |  | $ 0 | $ 0 |  |  |  |  |
C L P T Plan | Granted on May 31, 2022 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding stock options |  |  |  |  |  |  |  |  |  | 440 |  | 440 | 0 |  |  |  |  |
Exercise Price |  | $ 16.87 |  |  |  |  |  |  |  |  |  |  |  | 15.3 |  |  |  |
Exercise price |  |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 |  |  |  |  |  |
C L P T Plan | Granted on September 26, 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding stock options |  |  |  |  |  |  |  |  |  | 755 |  | 0 |  |  |  |  |  |
Exercise Price | $ 16.87 |  |  |  |  |  |  |  |  |  |  |  |  | $ 15.3 |  |  |  |
Exercise price |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |

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- Definition The description of the maximum term of options granted for a type of share-based payment arrangement that existed at any time during the period. An entity with substantially similar types of share-based payment arrangements may aggregate this information. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 45 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The description of the vesting requirements for a type of share-based payment arrangement that existed at any time during the period. An entity with substantially similar types of share-based payment arrangements may aggregate this information. [Refer: Share-based payment arrangements [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2023-01-01 -Paragraph 45 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45_a&doctype=Standard -URIDate 2023-03-23 + Details
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