XML 167 R153.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Retirement Benefit Plans - Maturity Analysis of Undiscounted Benefit Payments (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 TWD ($)
Disclosure of defined benefit plans [abstract] |
2024 | $ 2,538
2025 | 5,863
2026 | 8,865
2027 | 10,051
2028 and thereafter | 34,869
Total | $ 62,186

X
- Definition Estimated future benefit payments. + References No definition available. + Details
Name: | cht_EstimatedFutureBenefitPayments
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Estimated future benefit payments five fiscal years thereafter. + References No definition available. + Details
Name: | cht_EstimatedFutureBenefitPaymentsFiveFiscalYearsThereafter
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Estimated future benefit payments next twelve months. + References No definition available. + Details
Name: | cht_EstimatedFutureBenefitPaymentsNextTwelveMonths
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Estimated future benefit payments year four. + References No definition available. + Details
Name: | cht_EstimatedFutureBenefitPaymentsYearFour
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Estimated future benefit payments year three. + References No definition available. + Details
Name: | cht_EstimatedFutureBenefitPaymentsYearThree
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Estimated future benefit payments year two. + References No definition available. + Details
Name: | cht_EstimatedFutureBenefitPaymentsYearTwo
Namespace Prefix: | cht_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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