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Short-term Bills Payable - Summary of Short-term Bills Payable (Detail) $ in Millions	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)
Short Term Bills Payable [Abstract]
Commercial paper payable	$ 7,000,000,000		$ 0
Less: Discounts on commercial paper payable	(1,000,000)		0
Short-term bills payable	$ 6,999,000,000	$ 249	$ 0

X

- Definition

Discounts on commercial paper payable.

+ References

No definition available.

+ Details

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

X

- Definition

Short term bills payable.

+ References

No definition available.

+ Details

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

X

- Definition

Short-term bills payable.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of commercial paper issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_CommercialPapersIssued
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant