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Revenue from Contracts with Customers and Relevant Contract Assets and Liabilities - Detail Analysis of Contract with Customer Assets and Liabilities (Detail) - KRW (₩) ₩ in Millions		Dec. 31, 2020	Dec. 31, 2019
Disclosure of revenue from contracts with customers [line items]
Contract assets	[1]	₩ 586,438	₩ 557,041
Contract liabilities	[1]	384,133	365,610
Deferred revenue		29,593	65,228
Revenue from contracts with customers [member]
Disclosure of revenue from contracts with customers [line items]
Contract assets		672,672	655,329
Contract liabilities		413,707	413,442
Deferred revenue		₩ 89,694	₩ 92,557
[1] The amounts include adjustments arising from adoption of IFRS 15 (Note 26).

X

- Definition

The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_105&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2020-01-01
-Paragraph 116
-Subparagraph a
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-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
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Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2020-01-01
-Paragraph 105
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-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Period Type:	instant

X

- Definition

The amount of liability representing income that has been received but is not yet earned. [Refer: Revenue]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 78
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78&doctype=Standard
-URIDate 2020-01-01

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X

- Definition

Disclosure of revenue from contracts with customers [line items]

+ References

No definition available.

+ Details

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Namespace Prefix:	kt_
Data Type:	xbrli:stringItemType
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- Details

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