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Financial Risk Management - Summary of Details of Changes in Provisions for Impairment of Trade Receivables and Other Financial Assets at Amortized Costs (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Trade receivables [member]
Disclosure of financial assets [line items]
Beginning balance	₩ 343,738	₩ 349,725
Provision	69,972	64,522
Written-off	(80,126)	(68,298)
Others	(2,294)	(2,211)
Ending balance	331,290	343,738
Financial assets at amortised cost, class [member]
Disclosure of financial assets [line items]
Beginning balance	218,543	201,387
Provision	114,501	65,941
Written-off	(150,014)	(51,383)
Others	15,547	3,448
Reversal	(14,941)	(850)
Ending balance	₩ 183,636	₩ 218,543

X

- Definition

The amount of additional allowance for credit losses of financial assets recognised in profit or loss. [Refer: Allowance account for credit losses of financial assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expired 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 16
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2023-03-23

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expired 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 16
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2023-03-23

+ Details

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

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfFinancialAssetsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The decrease in an allowance account for credit losses of financial assets resulting from the reversal of impairment. [Refer: Allowance account for credit losses of financial assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expired 2023-01-01
-Name IFRS
-Number 7
-IssueDate 2023-01-01
-Paragraph 16
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2023-03-23

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Increase (decrease) through other changes, allowance account for credit losses of financial asset.

+ References

No definition available.

+ Details

Name:	kt_IncreaseDecreaseThroughOtherChangesAllowanceAccountForCreditLossesOfFinancialAsset
Namespace Prefix:	kt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Write off or transfer out of allowance account for credit losses of financial asset.

+ References

No definition available.

+ Details

Name:	kt_WriteOffOrTransferOutOfAllowanceAccountForCreditLossesOfFinancialAsset
Namespace Prefix:	kt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_TradeReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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