XML 126 R112.htm IDEA: XBRL DOCUMENT v3.24.1.u1

Investments Accounted For Using Equity Method - Additional Information (Detail)		1 Months Ended			12 Months Ended
	Jul. 31, 2021 NumberofSeat	Dec. 31, 2023 TWD ($) NumberofSeat	Nov. 30, 2022 TWD ($)	Apr. 30, 2022 TWD ($)	Dec. 31, 2023 TWD ($) NumberofSeat	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)	Mar. 31, 2022 TWD ($)	Aug. 31, 2021	Jun. 30, 2021 TWD ($)	Mar. 31, 2021 TWD ($)
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Investments in associates		$ 8,243,000,000			$ 8,243,000,000	$ 6,939,000,000
Investment in joint venture		$ 9,000,000			$ 9,000,000	$ 10,000,000
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%	41.90%
Price of investments in associates		$ 1,544,000,000			$ 1,544,000,000
Investments in associates		$ 4,293,000,000			$ 4,293,000,000	$ 3,173,000,000
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		23.00%			23.00%	23.00%
WiAdvance Technology Corporation ("WATC") [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Percentage of ownership in associates		19.00%			19.00%	20.00%					20.33%
No of seats allotted | NumberofSeat		1			1
Number of seats available for board of directors | NumberofSeat		3			3
Investments in associates											$ 274,000,000
Percentage of ownership in associates					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%
Investments in associates		$ 57,000,000			$ 57,000,000	$ 63,000,000				$ 56,000,000
Alliance Digital Tech Co., Ltd. ("ADT") [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Percentage of ownership in associates		0.00%			0.00%	0.00%
Investments in associates		$ 0			$ 0	$ 0
Gain on disposal of investment							$ 4,000,000
Percentage of ownership in associates	14.00%
Liquidation distribution							$ 9,000,000
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%	40.00%		40.00%
Investments in associates		$ 10,000,000			$ 10,000,000	$ 13,000,000		$ 20,000,000
Chunghwa SEA Holdings ("CHT SEA") [Member] | Joint ventures [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Investment in joint venture		$ 9,000,000			$ 9,000,000	$ 10,000,000
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		$ 285,000,000			$ 285,000,000	$ 247,000,000
Proceeds from capital reduction				$ 340,000,000
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%			50.00%
No of seats allotted | NumberofSeat		2			2
Number of seats available for board of directors | NumberofSeat		5			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%			49.00%
No of seats allotted | NumberofSeat		2			2
Number of seats available for board of directors | NumberofSeat		5			5
AgriTalk Technology Inc. ("ATT") [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Percentage of ownership in associates	17.19%					29.33%
No of seats allotted | NumberofSeat	1
Number of seats available for board of directors | NumberofSeat	3
Subscribed capital			$ 32,000,000
Imedtac Co., Ltd. ("IME") [Member]
Disclosure Of Significant Investments In Associates And Joint Ventures [Line Items]
Percentage of ownership in associates		6.74%			6.74%		6.74%		7.54%
No of seats allotted | NumberofSeat		1			1
Number of seats available for board of directors | NumberofSeat		5			5
Investments in associates		$ 11,000,000			$ 11,000,000

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

Liquidation distribution.

+ References

No definition available.

+ Details

Name:	cht_LiquidationDistribution
Namespace Prefix:	cht_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

Proceeds from capital reduction.

+ References

No definition available.

+ Details

Name:	cht_ProceedsFromCapitalReduction
Namespace Prefix:	cht_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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 gain on the disposal of investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 98
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_98_d&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_GainsOnDisposalsOfInvestments
Namespace Prefix:	ifrs-full_
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: Associates [member]; Investments accounted for using equity method]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard
-URIDate 2023-03-23

+ 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: Joint ventures [member]; Investments accounted for using equity method]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2023-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard
-URIDate 2023-03-23

+ 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: Associates [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2023-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_17_b_iii&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2023-01-01
-Paragraph 16
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_16_b_iii&doctype=Standard
-URIDate 2023-03-23

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2023-01-01
-Paragraph 21
-Subparagraph a
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_21_a_iv&doctype=Standard
-URIDate 2023-03-23

+ Details

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

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2023-01-01
-Paragraph 17
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_17_b_iii&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2023-01-01
-Paragraph 16
-Subparagraph b
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_16_b_iii&doctype=Standard
-URIDate 2023-03-23

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2023-01-01
-Paragraph 21
-Subparagraph a
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_21_a_iv&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_ProportionOfOwnershipInterestInJointVenture
Namespace Prefix:	ifrs-full_
Data Type:	dtr-types: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_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_AllianceDigitalTechCoLtdMember
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: