XML 133 R119.htm IDEA: XBRL DOCUMENT v3.25.1

Investments Accounted For Using Equity Method - Additional Information (Detail) $ in Millions, $ in Millions	1 Months Ended			12 Months Ended
	Dec. 31, 2023 TWD ($)	Nov. 30, 2022 TWD ($)	Apr. 30, 2022 TWD ($)	Dec. 31, 2024 TWD ($) NumberofSeat	Dec. 31, 2023 TWD ($)	Dec. 31, 2022	Oct. 31, 2024 TWD ($)	Aug. 31, 2024 TWD ($)	Aug. 31, 2024 USD ($)	May 31, 2024 TWD ($)	Apr. 30, 2024 TWD ($)	Feb. 28, 2024 USD ($)	Mar. 31, 2022 TWD ($)
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Investments in associates	$ 8,243			$ 8,870	$ 8,243
Investment in joint venture	$ 9			$ 9	$ 9
Next Commercial Bank Co., Ltd. ("NCB") [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Percentage of ownership in associates	46.26%			46.26%	46.26%	41.90%
Investments in associates	$ 4,293			$ 3,951	$ 4,293
Percentage of ownership in associates					46.26%
Reduction percentage of capital to offset accumulated deficit	26.43%
KingwayTek Technology Co., Ltd. ("KWT") [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Percentage of ownership in associates				22.58%
Senao Networks, Inc. ("SNI") [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Percentage of ownership in associates	34.00%			33.16%	34.00%
Investments in associates	$ 1,409			$ 1,849	$ 1,409		$ 376
Taiwania Hive Technology Fund L.P. ('TWTF') [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Percentage of ownership in associates	0.00%			42.00%	0.00%			41.75%	41.75%
Investments in associates	$ 0			$ 276	$ 0			$ 288	$ 9			$ 30
Porrima Inc. ('PORRIMA') [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Percentage of ownership in associates	0.00%			10.00%	0.00%					10.00%
Investments in associates	$ 0			$ 78	$ 0					$ 80
WiAdvance Technology Corporation ("WATC") [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
No of seats allotted | NumberofSeat				1
Number of seats available for board of directors | NumberofSeat				5
Percentage of ownership in associates				16.24%	19.22%	20.05%
CHT Infinity Singapore Pte. Ltd. ("CISG") [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Percentage of ownership in associates	40.00%			40.00%	40.00%
Investments in associates	$ 57			$ 61	$ 57
Baohwa Trust Co., Ltd. [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Percentage of ownership in associates	25.00%			25.00%	25.00%								40.00%
Price of investments in associates	$ 1,544				$ 1,544
Investments in associates	10			$ 12	10								$ 20
Chunghwa SEA Holdings ("CHT SEA") [Member] | Joint ventures [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Investment in joint venture	$ 9			$ 9	$ 9
Percentage of ownership in joint venture				51.00%	51.00%
ST-2 Satellite Ventures Pte., Ltd. ("STS") [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Percentage of ownership in associates	38.00%			38.00%	38.00%
Investments in associates	$ 285			$ 313	$ 285
Subscribed capital			$ 340
Chunghwa PChome Fund I Co., Ltd. ("CPFI") [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Percentage of ownership in associates				50.00%
No of seats allotted | NumberofSeat				2
Number of seats available for board of directors | NumberofSeat				5
Cornerstone Ventures Co., Ltd. ("CVC") [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Percentage of ownership in associates				49.00%
AgriTalk Technology Inc. ("ATT") [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Percentage of ownership in associates						29.33%
Subscribed capital		$ 32
Imedtac Co., Ltd. ("IME") [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Percentage of ownership in associates				10.00%
No of seats allotted | NumberofSeat				1
Number of seats available for board of directors | NumberofSeat				5
Investments in associates	$ 11				$ 11						$ 32

X

- Definition

Disclosure of significant investments in associates and joint ventures.

+ References

No definition available.

+ Details

Name:	cht_DisclosureOfSignificantInvestmentsInAssociatesAndJointVenturesLineItems
Namespace Prefix:	cht_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

No of seats allotted.

+ References

No definition available.

+ Details

Name:	cht_NumberOfSeatsAllotted
Namespace Prefix:	cht_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of seats available for board of directors.

+ References

No definition available.

+ Details

Name:	cht_NumberOfSeatsAvailableForBoardOfDirectors
Namespace Prefix:	cht_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of ownership interest in associate.

+ References

No definition available.

+ Details

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

X

- Definition

Price of investments in associates accounted for using equity method.

+ References

No definition available.

+ Details

Name:	cht_PriceOfInvestmentsInAssociatesAccountedForUsingEquityMethod
Namespace Prefix:	cht_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Reduction percentage of capital to offset accumulated deficit.

+ References

No definition available.

+ Details

Name:	cht_ReductionPercentageOfCapitalToOffsetAccumulatedDeficit
Namespace Prefix:	cht_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Subscribed capital.

+ References

No definition available.

+ Details

Name:	cht_SubscribedCapital
Namespace Prefix:	cht_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of investments in associates accounted for using the equity method. [Refer: Total for all associates [member]; Investments accounted for using equity method]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_InvestmentsInAssociatesAccountedForUsingEquityMethod
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of investments in joint ventures accounted for using the equity method. [Refer: Total for all joint ventures [member]; Investments accounted for using equity method]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_InvestmentsInJointVenturesAccountedForUsingEquityMethod
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The proportion of ownership interest in an associate attributable to the entity. [Refer: Total for all associates [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2024-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_17_b_iii&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2024-01-01
-Paragraph 16
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_16_b_iii&doctype=Standard
-URIDate 2024-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2024-01-01
-Paragraph 21
-Subparagraph a
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_21_a_iv&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_ProportionOfOwnershipInterestInAssociate
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Total for all joint ventures [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2024-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_17_b_iii&doctype=Standard
-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2024-01-01
-Paragraph 16
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_16_b_iii&doctype=Standard
-URIDate 2024-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2024-01-01
-Paragraph 21
-Subparagraph a
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_21_a_iv&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_ProportionOfOwnershipInterestInJointVenture
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_SignificantInvestmentsInAssociatesAxis=cht_NextCommercialBankCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInAssociatesAxis=cht_KingwayTekTechnologyCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInAssociatesAxis=cht_SenaoNetworksIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInAssociatesAxis=cht_TaiwaniaHiveTechnologyFundLPMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInAssociatesAxis=cht_PorrimaIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInAssociatesAxis=cht_WiAdvanceTechnologyCorporationWATCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInAssociatesAxis=cht_CHTInfinitySingaporePteLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInAssociatesAxis=cht_BaohwaTrustCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInAssociatesAxis=cht_ChunghwaSEAHoldingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_JointVenturesAxis=ifrs-full_JointVenturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_SignificantInvestmentsInAssociatesAxis=cht_ST2SatelliteVenturesPteLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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