XML 100 R86.htm IDEA: XBRL DOCUMENT v3.24.1.u1

Summary of Material Accounting Policy Information - Detail Information of Subsidiaries (Parenthetical) (Detail)	Dec. 31, 2023	Dec. 31, 2022	Nov. 30, 2022	May 31, 2022	Mar. 31, 2022
Chunghwa Sochamp Technology Inc. ("CHST") [Member]
Disclosure of subsidiaries [Line Items]
Percentage of Ownership interests	37.00%	37.00%
Chunghwa Leading Photonics Tech Co., Ltd. ("CLPT") [Member]
Disclosure of subsidiaries [Line Items]
Percentage of Ownership interests	74.56%	75.00%
Spring House Entertainment Tech. Inc. ("SHE") [Member]
Disclosure of subsidiaries [Line Items]
Percentage of Ownership interests	56.00%	56.00%
CHT Security Co., Ltd. ("CHTSC") [Member]
Disclosure of subsidiaries [Line Items]
Percentage of Ownership interests	69.28%	73.09%
International Integrated Systems, Inc. ("IISI") [Member]
Disclosure of subsidiaries [Line Items]
Percentage of Ownership interests	51.00%	51.00%
Senao International (Samoa) Holding Ltd. ("SIS") [Member]
Disclosure of subsidiaries [Line Items]
Percentage of Ownership			96.26%
Chunghwa Precision Test Tech. Co., Ltd. ("CHPT") [Member]
Disclosure of subsidiaries [Line Items]
Percentage of additional ownership interest obtained					100.00%
TestPro Investment Co., Ltd. ("TestPro") [Member]
Disclosure of subsidiaries [Line Items]
Percentage of additional ownership interest obtained				54.25%
Unitronics Technology Corp. ("UTC") [Member]
Disclosure of subsidiaries [Line Items]
Percentage of Ownership interests	100.00%
Chunghwa | Chunghwa Sochamp Technology Inc. ("CHST") [Member]
Disclosure of subsidiaries [Line Items]
Percentage of Ownership interests	37.09%
Chunghwa Telecom Co., Ltd. and Chunghwa Investment Co., Ltd. [Member] | CHIEF Telecom Inc. ("CHIEF") [Member]
Disclosure of subsidiaries [Line Items]
Percentage of Ownership interests	58.63%	58.67%
Chunghwa Telecom Co., Ltd. and Chunghwa Investment Co., Ltd. [Member] | Chunghwa Leading Photonics Tech Co., Ltd. ("CLPT") [Member]
Disclosure of subsidiaries [Line Items]
Percentage of Ownership interests	74.56%
Chunghwa Investment Co., Ltd. ("CHI") [Member] | Chunghwa Precision Test Tech. Co., Ltd. ("CHPT") [Member] | Bottom of Range [Member]
Disclosure of subsidiaries [Line Items]
Percentage of Ownership interests	50.00%
Chunghwa Precision Test Tech. International Ltd. ("CHPT (International)") [Member] | Su Zhou Precision Test Tech. Ltd. ("SZPT") [Member]
Disclosure of subsidiaries [Line Items]
Percentage of Ownership interests	100.00%	100.00%

X

- Definition

Percentage of additional ownership interest obtained.

+ References

No definition available.

+ Details

Name:	cht_PercentageOfAdditionalOwnershipInterestObtained
Namespace Prefix:	cht_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of ownership interest in subsidiary.

+ References

No definition available.

+ Details

Name:	cht_PercentageOfOwnershipInterestInSubsidiary
Namespace Prefix:	cht_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of reduction in capital to offset accumulated deficits.

+ References

No definition available.

+ Details

Name:	cht_PercentageOfReductionInCapitalToOffsetAccumulatedDeficits
Namespace Prefix:	cht_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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_DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cht_ChunghwaSochampTechnologyIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cht_ChunghwaLeadingPhotonicsTechCoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cht_SpringHouseEntertainmentTechIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cht_ChunghwaTelecomSecurityCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cht_InternationalIntegratedSystemsIncIISIMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cht_SenaoInternationalSamoaHoldingLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cht_ChunghwaPrecisionTestTechCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cht_TestproInvestmentCoLtdTestproMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cht_UnitronicsTechnologyCorpUTCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=cht_ChunghwaTelecomCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=cht_ChunghwaTelecomCoLtdAndChunghwaInvestmentCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cht_CHIEFTelecomIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=cht_ChunghwaInvestmentCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	ifrs-full_CategoriesOfRelatedPartiesAxis=cht_ChunghwaPrecisionTestTechInternationalLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cht_SuZhouPrecisionTestTechLtdSZPTMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: