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Trade and Other Payables - Summary of Other Payables (Parenthetical) (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Trade and other payables [abstract]
Settlement payables related to credit card transaction	₩ 1,007,171	₩ 1,824,068

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No definition available.

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

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- Definition

Credit Card Transaction Settlement Payable

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No definition available.

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