XML 185 R171.htm IDEA: XBRL DOCUMENT
v3.25.1

Revenue - Summary of Revenue Recognized (Detail) - TWD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Revenue [abstract] |  |  |
Telecommunications business | $ 6,721 | $ 6,660 | $ 6,626
Project business | 4,474 | 5,290 | 4,067
Others | 459 | 540 | 440
Contracts with customers revenue recognized | $ 11,654 | $ 12,490 | $ 11,133

X
- Definition Contracts with customers revenue recognized. + References No definition available. + Details
Name: | cht_ContractsWithCustomersRevenueRecognized
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Revenue from others services. + References No definition available. + Details
Name: | cht_RevenueFromOtherServices
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Revenue from project business. + References No definition available. + Details
Name: | cht_RevenueFromProjectBusiness
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Revenue from telecommunications business. + References No definition available. + Details
Name: | cht_RevenueFromTelecommunicationsBusiness
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | ifrs-full_RevenueAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration