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Provisions - Summary of Provisions (Detail) $ in Millions, $ in Millions	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2018 TWD ($)	Dec. 31, 2017 TWD ($)
Provisions [Abstract]
Warranties	$ 182		$ 173
Onerous contracts	171		67
Employee benefits	57		59
Others	5		5
Provisions	415		304	$ 207	$ 180
Current	314	$ 11	207
Noncurrent	$ 101	$ 4	$ 97

X

- Definition

Provisions for onerous contracts.

+ 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 current provisions. [Refer: Provisions]

+ References

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-Name IAS
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-IssueDate 2020-01-01
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X

- Definition

The amount of miscellaneous other provisions. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 78
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Balance Type:	credit
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X

- Definition

The amount of non-current provisions. [Refer: Provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2020-01-01
-Paragraph 54
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Balance Type:	credit
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X

- Definition

The amount of liabilities of uncertain timing or amount.

+ References

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-IssueDate 2020-01-01
-Paragraph 54
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X

- References

No definition available.

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

X

- Definition

The amount of provisions for employee benefits. [Refer: Employee benefits expense; Provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 78
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-URIDate 2020-01-01

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X

- Definition

The amount of provision for estimated costs of making good under warranties for products sold. [Refer: Provisions]

+ References

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-Name IAS
-Number 37
-IssueDate 2020-01-01
-Section Example 1 Warranties
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