XML 187 R173.htm IDEA: XBRL DOCUMENT
v3.25.1

Revenue - Additional Information (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2027 TWD ($) | Dec. 31, 2026 TWD ($) | Dec. 31, 2025 TWD ($)
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |  |
Amortization of incremental costs of obtaining contracts | $ 906 | $ 28 | $ 856 | $ 841 |  |  |
Telecommunications Business [Member] |  |  |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |  |
Transaction price allocated to performance obligations | $ 41,020 |  |  |  |  |  |
Remaining performance obligations, timing of satisfaction | The Company expects to recognize such revenue of $24,078 million, $12,627 million and $4,315 million in 2025, 2026 and 2027, respectively. | The Company expects to recognize such revenue of $24,078 million, $12,627 million and $4,315 million in 2025, 2026 and 2027, respectively. |  |  |  |  |
Telecommunications Business [Member] | Year 1 [Member] | Forecast [Member] |  |  |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |  |
Transaction price allocated to performance obligations |  |  |  |  |  |  | $ 24,078
Telecommunications Business [Member] | Later than one year and not later than two years [member] | Forecast [Member] |  |  |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |  |
Transaction price allocated to performance obligations |  |  |  |  |  | $ 12,627 |
Telecommunications Business [Member] | Later than two years and not later than three years [member] | Forecast [Member] |  |  |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |  |
Transaction price allocated to performance obligations |  |  |  |  | $ 4,315 |  |
Project Business [Member] |  |  |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |  |
Transaction price allocated to performance obligations | $ 34,104 |  |  |  |  |  |
Remaining performance obligations, timing of satisfaction | The Company recognizes revenues when the project business contract is completed and accepted by customers. The Company expects to recognize such revenue of $12,617 million, $10,413 million and $11,074 million in 2025, 2026 and 2027, respectively. | The Company recognizes revenues when the project business contract is completed and accepted by customers. The Company expects to recognize such revenue of $12,617 million, $10,413 million and $11,074 million in 2025, 2026 and 2027, respectively. |  |  |  |  |
Project Business [Member] | Year 1 [Member] | Forecast [Member] |  |  |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |  |
Transaction price allocated to performance obligations |  |  |  |  |  |  | $ 12,617
Project Business [Member] | Later than one year and not later than two years [member] | Forecast [Member] |  |  |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |  |
Transaction price allocated to performance obligations |  |  |  |  |  | $ 10,413 |
Project Business [Member] | Later than two years and not later than three years [member] | Forecast [Member] |  |  |  |  |  |  |
Revenue From Contract With Customer [Line Items] |  |  |  |  |  |  |
Transaction price allocated to performance obligations |  |  |  |  | $ 11,074 |  |

X
- Definition Revenue from contract with customer. + References No definition available. + Details
Name: | cht_RevenueFromContractWithCustomerLineItems
Namespace Prefix: | cht_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of amortisation for assets recognised from the costs incurred to obtain or fulfil contracts with customers. [Refer: Assets recognised from costs to obtain or fulfil contracts with customers; Amortisation expense] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 128 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_128_b&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_AmortisationAssetsRecognisedFromCostsIncurredToObtainOrFulfilContractsWithCustomers
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The explanation of when the entity expects to recognise the transaction price allocated to the remaining performance obligations as revenue. [Refer: Revenue from contracts with customers; Transaction price allocated to remaining performance obligations] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 120 -Subparagraph b -Clause ii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_120_b_ii&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ExplanationOfWhenEntityExpectsToRecogniseTransactionPriceAllocatedToRemainingPerformanceObligationsAsRevenue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the transaction price allocated to the performance obligations that are unsatisfied (or partially unsatisfied) as of the end of the reporting period. The transaction price is the amount of consideration to which an entity expects to be entitled in exchange for transferring promised goods or services to a customer, excluding amounts collected on behalf of third parties (for example, some sales taxes). [Refer: Performance obligations [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 120 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_120_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_TransactionPriceAllocatedToRemainingPerformanceObligations
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cht_TelecommunicationsBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | ifrs-full_ProductsAndServicesAxis=cht_ProjectBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |