XML 106 R95.htm IDEA: XBRL DOCUMENT
v3.20.1

Financial Instruments at Fair Value Through Profit or Loss - Additional Information (Detail) - Taiwania Capital Buffalo Fund Co Ltd [Member] $ in Millions | 1 Months Ended
--- | ---
Oct. 31, 2019 TWD ($)
Disclosure of detailed information about financial instruments [Line Items] |
Amount invested in investment entity | $ 300
Ownership percentage in investment entity | 12.90%

X
- Definition Equity ownership percentage in investment entity. + References No definition available. + Details
Name: | cht_EquityOwnershipPercentageInInvestmentEntity
Namespace Prefix: | cht_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of financial assets that are measured at fair value and for which gains (losses) are recognised in profit or loss. A financial asset shall be measured at fair value through profit or loss unless it is measured at amortised cost or at fair value through other comprehensive income. A gain (loss) on a financial asset measured at fair value shall be recognised in profit or loss unless it is part of a hedging relationship, it is an investment in an equity instrument for which the entity has elected to present gains and losses in other comprehensive income or it is a financial asset measured at fair value through other comprehensive income. [Refer: At fair value [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 8 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_8_a&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLoss
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=cht_TaiwaniaCapitalBuffaloFundCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |