XML 154 R142.htm IDEA: XBRL DOCUMENT v3.21.1

Borrowings - Summary of Korean Won and Foreign Currency Borrowings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]
Interest rate	0.00%
Maturity yield	5.00%
Storywiz Co Ltd [Member]
Disclosure of detailed information about borrowings [line items]
Appraisal period of common stock conversion to debt	(appraisal period: June 5, 2021~ May 4, 2025)

X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_BorrowingsInterestRate
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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

X

- Definition

Appraisal period of common stock conversion to debt.

+ References

No definition available.

+ Details

Name:	kt_AppraisalPeriodOfCommonStockConversionToDebt
Namespace Prefix:	kt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Borrowings maturity yield.

+ References

No definition available.

+ Details

Name:	kt_BorrowingsMaturityYield
Namespace Prefix:	kt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	ifrs-full_CounterpartiesAxis=kt_StorywizCoLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: