XML 229 R217.htm IDEA: XBRL DOCUMENT v3.21.1

Fair Value - Summary of Carrying Amount and Fair Value of Financial Instruments by Category (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Financial assets	₩ 10,476,853	₩ 11,000,665
Financial liabilities	14,597,106	16,128,644
Trade and other payables [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	7,017,639	8,679,698
Borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	7,316,298	7,298,867
Financial Liabilities At Amortized Costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	132,558	129,945
Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	2,682	38
Derivative financial liabilities for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	127,929	20,096
Cash and cash equivalents [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	2,634,624	2,305,894
Financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	4,976,423	5,748,459
Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,118,619	1,256,266
Other financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	671,068	441,804
Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	809,919	632,324
Other financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	258,516	557,342
Derivatives financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	7,684	58,576
Fair value [member] | Trade and other payables [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	1	1
Fair value [member] | Borrowings [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	1	1
Fair value [member] | Financial Liabilities At Amortized Costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	1	1
Fair value [member] | Financial liabilities designated as at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	2,682	38
Fair value [member] | Derivative financial liabilities for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities	127,929	20,096
Fair value [member] | Cash and cash equivalents [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1	1
Fair value [member] | Financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1	1
Fair value [member] | Financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1,118,619	1,256,266
Fair value [member] | Other financial assets at amortized costs [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	1	1
Fair value [member] | Financial assets at fair value through profit or loss [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	809,919	632,324
Fair value [member] | Other financial assets at fair value through other comprehensive income [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	258,516	557,342
Fair value [member] | Derivatives financial assets for hedging [member]
Disclosure of detailed information about financial instruments [line items]
Financial assets	₩ 7,684	₩ 58,576

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 assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_25&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 35H
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35H&doctype=Standard
-URIDate 2020-01-01

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 35I
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35I&doctype=Standard
-URIDate 2020-01-01

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 35M
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35M&doctype=Standard
-URIDate 2020-01-01

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 35N
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_35N&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_FinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_25&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_FinancialLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	ifrs-full_CategoriesOfFinancialLiabilitiesAxis=kt_TradeAndOtherPayableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfFinancialLiabilitiesAxis=kt_Borrowings1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfFinancialLiabilitiesAxis=ifrs-full_FinancialLiabilitiesAtAmortisedCostMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfFinancialLiabilitiesAxis=ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfFinancialLiabilitiesAxis=kt_DerivativesFinancialLiabilitiesForHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfFinancialAssetsAxis=kt_CashAndCashEquivalentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_FinancialAssetsAtAmortisedCostMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfFinancialAssetsAxis=kt_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfFinancialAssetsAxis=kt_OtherFinancialAssetsAtAmortizedCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfFinancialAssetsAxis=kt_OtherFinancialAssetsAtFairValueThroughOtherComprehensiveIncomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_CategoriesOfFinancialAssetsAxis=kt_DerivativesFinancialAssetsForHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_MeasurementAxis=ifrs-full_AtFairValueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: