XML 215 R201.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Financial Instruments - Foreign Currency Risk Sensitivity Analysis (Detail) - TWD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Profit and loss [Member] | Financial instruments [Member] | USD [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Sensitivity analysis due to a 5% increase or decrease in foreign currency exchange | $ 51 | $ 75 | $ 56
Profit and loss [Member] | Financial instruments [Member] | EUR [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Sensitivity analysis due to a 5% increase or decrease in foreign currency exchange | (30) | (39) | (41)
Profit and loss [Member] | Financial instruments [Member] | SGD [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Sensitivity analysis due to a 5% increase or decrease in foreign currency exchange | (47) | (69) | (85)
Profit and loss [Member] | Financial instruments [Member] | RMB [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Sensitivity analysis due to a 5% increase or decrease in foreign currency exchange | 6 | 0 | 3
Profit and loss [Member] | Derivatives [Member] | EUR [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Sensitivity analysis due to a 5% increase or decrease in foreign currency exchange | 7 | 3 | 13
Equity [member] | Derivatives [Member] | EUR [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Sensitivity analysis due to a 5% increase or decrease in foreign currency exchange | $ 1 | $ 22 | $ 11

X
- Definition Change in equity due to risk exposure arises from possible changes in foreign exchange rates. + References No definition available. + Details
Name: | cht_ChangeInEquityDueToRiskExposureArisesFromPossibleChangesInForeignExchangeRates
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Change in profit or loss due to risk exposure arises from possible changes in foreign exchange rates. + References No definition available. + Details
Name: | cht_ChangeInProfitOrLossDueToRiskExposureArisesFromPossibleChangesInForeignExchangeRates
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
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_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | cht_SensitivityAnalysisAxis=cht_ProfitAndLossMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=cht_FinancialInstrumentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_EUR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_SGD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_CNY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=ifrs-full_DerivativesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cht_SensitivityAnalysisAxis=ifrs-full_EquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |