XML 109 R95.htm IDEA: XBRL DOCUMENT
v3.25.1

Cash and Cash Equivalents - Annual Yield Rates of Bank Deposits, Commercial Paper, Negotiable Certificates of Deposit and Time Deposits and Repurchase Agreements Collateralized by Bonds (Detail) | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Bank deposits [Member] | Top of Range [Member] |  |
Disclosure of cash and cash equivalents [Line Items] |  |
Yield rate | 2.55% | 3.10%
Bank deposits [Member] | Bottom of Range [Member] |  |
Disclosure of cash and cash equivalents [Line Items] |  |
Yield rate | 0.00% | 0.00%
Commercial paper [Member] | Top of Range [Member] |  |
Disclosure of cash and cash equivalents [Line Items] |  |
Yield rate | 1.56% | 1.33%
Commercial paper [Member] | Bottom of Range [Member] |  |
Disclosure of cash and cash equivalents [Line Items] |  |
Yield rate | 0.95% | 0.72%
Negotiable certificates of deposit [Member] |  |
Disclosure of cash and cash equivalents [Line Items] |  |
Yield rate |  | 1.38%
Negotiable certificates of deposit [Member] | Top of Range [Member] |  |
Disclosure of cash and cash equivalents [Line Items] |  |
Yield rate | 1.70% |
Negotiable certificates of deposit [Member] | Bottom of Range [Member] |  |
Disclosure of cash and cash equivalents [Line Items] |  |
Yield rate | 1.55% |
Time deposits [Member] | Top of Range [Member] |  |
Disclosure of cash and cash equivalents [Line Items] |  |
Yield rate | 4.90% | 5.50%
Time deposits [Member] | Bottom of Range [Member] |  |
Disclosure of cash and cash equivalents [Line Items] |  |
Yield rate | 0.01% | 0.01%

X
- Definition Disclosure of cash and cash equivalents. + References No definition available. + Details
Name: | cht_DisclosureOfCashAndCashEquivalentsLineItems
Namespace Prefix: | cht_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Yield rate. + References No definition available. + Details
Name: | cht_YieldRate
Namespace Prefix: | cht_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=cht_BankDepositsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=cht_CommercialPaper1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=cht_NegotiableCertificatesOfDepositMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=cht_TimeDepositsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |