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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, 2018	Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items]
Related amount	₩ 6,648,293	₩ 6,683,662
Land and buildings [member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying amount	13,163	13,115
Secured amount	₩ 15,113	₩ 15,995
Related line item	Borrowings	Borrowings
Related amount	₩ 7,878	₩ 2,730
Secured party	Standard Chartered Bank, Korea Development Bank	Standard Chartered Bank, Korea Development Bank
Others [member]
Disclosure of detailed information about property, plant and equipment [line items]
Carrying amount	₩ 50,278	₩ 53,757
Secured amount	40,252	38,570
Related amount	₩ 10,063	₩ 16,071
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
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-IssueDate 2018-01-01
-Paragraph 55
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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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- 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 2018-01-01
-Paragraph 74
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_74_a&doctype=Standard
-URIDate 2018-03-16

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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_
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Balance Type:	credit
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- Definition

Secured party.

+ References

No definition available.

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- Details

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