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Property and Equipment - Summary of the Details of Property and Equipment Provided (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items]
Related amount	₩ 7,298,867	₩ 6,648,293
Land and buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying amount	17,097	13,163
Secured amount	₩ 18,705	₩ 15,113
Related line item	Borrowings	Borrowings
Related amount	₩ 4,347	₩ 7,878
Secured party	Industrial Bank of Korea, Korea Development Bank, K Bank, Inc.	Standard Chartered Bank, Korea Development Bank
Others [member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying amount	₩ 45,851	₩ 50,278
Secured amount	41,681	40,252
Related amount	₩ 3,473	₩ 10,063
Secured party	Shinhan Bank	Shinhan Bank

X

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 55
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-URIDate 2019-03-27

+ Details

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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

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X

- Definition

The amount of property, plant and equipment pledged as security for liabilities. [Refer: Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2019-01-01
-Paragraph 74
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_74_a&doctype=Standard
-URIDate 2019-03-27

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- Definition

Related amount description in property plant and equipment

+ References

No definition available.

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- Definition

Secured amount in property plan and equipment.

+ References

No definition available.

+ Details

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Namespace Prefix:	kt_
Data Type:	xbrli:monetaryItemType
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- Definition

Secured party.

+ References

No definition available.

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- Details

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- Details

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