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Related Parties Transactions - Schedule of Bank Deposits and Other Financial Assets (Details) - TWD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Next Commercial Bank Co., Ltd. ("NCB") [Member] |  |
Disclosure of transactions between related parties [line items] |  |
Bank deposits and other financial assets | $ 1,132 | $ 0

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- 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

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- 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

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