XML 226 R212.htm IDEA: XBRL DOCUMENT
v3.25.1

Fair Value Information - Schedule of Percentage Decrease in Discount for Lack of Marketability or Noncontrolling Interests Discount (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Growth rate of long-term revenue | 0.12% | 0.19%
Bottom of Range [Member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Discount for lack of marketability | 20.00% | 3.75%
Noncontrolling interests discount | 15.00% | 17.01%
Discount rate | 8.32% | 7.11%
Top of Range [Member] |  |
Disclosure Of Fair Value Measurement Of Assets And Liabilities [Line Items] |  |
Discount for lack of marketability | 30.00% | 20.00%
Noncontrolling interests discount | 29.04% | 25.00%
Discount rate | 14.40% | 8.20%

X
- Definition Disclosure of fair value measurement of assets and liabilities. + References No definition available. + Details
Name: | cht_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems
Namespace Prefix: | cht_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Discount rate of noncontrolling interests. + References No definition available. + Details
Name: | cht_DiscountRateOfNoncontrollingInterests
Namespace Prefix: | cht_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Discount rate percentage. + References No definition available. + Details
Name: | cht_DiscountRatePercentage
Namespace Prefix: | cht_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Growth rate of long-term revenue. + References No definition available. + Details
Name: | cht_GrowthRateOfLongTermRevenue
Namespace Prefix: | cht_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of discount for lack of marketability. + References No definition available. + Details
Name: | cht_PercentageOfDiscountForLackOfMarketability
Namespace Prefix: | cht_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
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: |