XML 225 R211.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Fair Value Information - Schedule of Impact of Decrease in Discount for Lack of Marketability or Noncontrolling Interests (Detail) - TWD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Disclosure Of Fair Value Measurement Of Financial Instruments [Abstract] |  |
Discount for lack of marketability, 5% increase | $ (49) | $ (33)
Discount for lack of marketability, 5% decrease | 45 | 33
Noncontrolling interests discount, 5% increase | (22) | (24)
Noncontrolling interests discount, 5% decrease | 22 | 24
Long-term revenue growth rates, 0.1% increase | 35 | 30
Long-term revenue growth rates, 0.1% decrease | (35) | (29)
Discount rate, 1% increase | (396) | (330)
Discount rate, 1% decrease | $ 488 | $ 407

X
- Definition Amount of discount for lack of marketability five percentage decrease. + References No definition available. + Details
Name: | cht_AmountOfDiscountForLackOfMarketabilityFivePercentageDecrease
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of discount for lack of marketability five percentage increase. + References No definition available. + Details
Name: | cht_AmountOfDiscountForLackOfMarketabilityFivePercentageIncrease
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of Noncontrolling interests discount five percentage decrease. + References No definition available. + Details
Name: | cht_AmountOfNoncontrollingInterestsDiscountFivePercentageDecrease
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of noncontrolling interests discount five percentage increase. + References No definition available. + Details
Name: | cht_AmountOfNoncontrollingInterestsDiscountFivePercentageIncrease
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Discount rate one percentage decrease. + References No definition available. + Details
Name: | cht_DiscountRateOnePercentageDecrease
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Discount rate one percentage increase. + References No definition available. + Details
Name: | cht_DiscountRateOnePercentageIncrease
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Long-term revenue growth rates Zero point one decrease. + References No definition available. + Details
Name: | cht_LongTermRevenueGrowthRatesZeroPointOnePercentageDecrease
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Long-term revenue growth rates Zero point one increase. + References No definition available. + Details
Name: | cht_LongTermRevenueGrowthRatesZeroPointOnePercentageIncrease
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration