XML 136 R122.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Lease Arrangements - Additional Information (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 TWD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2021 TWD ($)
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |  |  |  |
Impairment loss on right-of-use assets | $ 0 | $ 0 | $ 0 | $ 420,000,000
Sublease | $ 0 |  | $ 0 | $ 0
Bottom of Range [Member] | Offices, Server rooms and Stores [Member] |  |  |  |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |  |  |  |
Lease Term | 1 year | 1 year |  |
Top of Range [Member] | Offices, Server rooms and Stores [Member] |  |  |  |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |  |  |  |
Lease Term | 30 years | 30 years |  |
Taiwan [Member] | Bottom of Range [Member] | Handsets Base Stations [Member] |  |  |  |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |  |  |  |
Lease Term | 1 year | 1 year |  |
Taiwan [Member] | Top of Range [Member] | Handsets Base Stations [Member] |  |  |  |
Disclosure Of Quantitative Information About Rightofuse Assets [Line Items] |  |  |  |
Lease Term | 20 years | 20 years |  |

X
- Definition Impairment of right-of-use assets. + References No definition available. + Details
Name: | cht_ImpairmentOfRightOfUseAssets
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Lease term. + References No definition available. + Details
Name: | cht_LeaseTerm
Namespace Prefix: | cht_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of income from subleasing right-of-use assets. Sublease is a transaction for which an underlying asset is re-leased by a lessee (‘intermediate lessor’) to a third party, and the lease (‘head lease’) between the head lessor and lessee remains in effect. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 53 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_f&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_IncomeFromSubleasingRightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_OtherPropertyPlantAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_TW
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=cht_HandsetsBaseStationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |