XML 218 R204.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Financial Instruments - Liquidity Analysis for Derivative Financial Instruments (Detail) - TWD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Undiscounted gross inflows (outflows) on derivatives | $ 0 | $ 16
Forward exchange contracts inflows [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Undiscounted gross inflows on derivatives | 169 | 501
Forward exchange contracts outflows [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Undiscounted gross outflows on derivatives | 169 | 485
Less Than 30 Days [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Undiscounted gross inflows (outflows) on derivatives | 0 | 0
Less Than 30 Days [Member] | Forward exchange contracts inflows [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Undiscounted gross inflows on derivatives | 0 | 0
Less Than 30 Days [Member] | Forward exchange contracts outflows [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Undiscounted gross outflows on derivatives | 0 | 0
1-3 Months [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Undiscounted gross inflows (outflows) on derivatives | 0 | 16
1-3 Months [Member] | Forward exchange contracts inflows [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Undiscounted gross inflows on derivatives | 169 | 501
1-3 Months [Member] | Forward exchange contracts outflows [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Undiscounted gross outflows on derivatives | 169 | 485
3 Months to 1 Year [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Undiscounted gross inflows (outflows) on derivatives | 0 | 0
3 Months to 1 Year [Member] | Forward exchange contracts inflows [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Undiscounted gross inflows on derivatives | 0 | 0
3 Months to 1 Year [Member] | Forward exchange contracts outflows [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Undiscounted gross outflows on derivatives | 0 | 0
1-5 Years [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Undiscounted gross inflows (outflows) on derivatives | 0 | 0
1-5 Years [Member] | Forward exchange contracts inflows [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Undiscounted gross inflows on derivatives | 0 | 0
1-5 Years [Member] | Forward exchange contracts outflows [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [Line Items] |  |
Undiscounted gross outflows on derivatives | $ 0 | $ 0

X
- Definition Derivative financial assets liabilities undiscounted cash flows. + References No definition available. + Details
Name: | cht_DerivativeFinancialAssetsLiabilitiesUndiscountedCashFlows
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Derivative financial assets liabilities undiscounted cash inflows. + References No definition available. + Details
Name: | cht_DerivativeFinancialAssetsLiabilitiesUndiscountedCashInflows
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Derivative financial assets liabilities undiscounted cash outflows. + References No definition available. + Details
Name: | cht_DerivativeFinancialAssetsLiabilitiesUndiscountedCashOutflows
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneMonthMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneMonthAndNotLaterThanThreeMonthsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanThreeMonthsAndNotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |