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Related Parties Transactions - Schedule of Bank Deposits and Other Financial Assets (Details) - TWD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Next Commercial Bank Co., Ltd. ("NCB") [Member]
Disclosure of transactions between related parties [line items]
Bank deposits and other financial assets	$ 2,709	$ 1,132

X

- Definition

Bank deposits and other financial assets.

+ References

No definition available.

+ Details

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

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

X

- Details

Name:	dei_LegalEntityAxis=cht_NextCommercialBankCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: