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Financial Assets at Amortized Cost - Noncurrent - Corporate Bonds (Detail) - TWD ($) $ in Millions	Dec. 31, 2024	Oct. 31, 2024	Dec. 31, 2023
Disclosure of financial assets [line items]
Corporate bonds	$ 30,488		$ 30,483
Fubon Life Insurance Co [member]
Disclosure of financial assets [line items]
Corporate bonds	$ 2,000	$ 2,000	$ 0

X

- Definition

The amount of investments in corporate bonds.

+ References

No definition available.

+ Details

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Namespace Prefix:	cht_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of bonds issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

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

X

- Details

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