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Investments in Associates and Joint Ventures - Summary of Changes in Investments in Associates and Joint Ventures (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	₩ 272,407	₩ 279,431
Acquisition (Disposal)	13,021	26,912
Share of net profit from associates and joint ventures	(3,252)	5,912
Others	(14,516)	(39,848)
Ending	267,660	272,407
Korea Information & Technology Fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	148,255	139,534
Share of net profit from associates and joint ventures	17,956	15,037
Others	(2,236)	(6,316)
Ending	163,975	148,255
KT-SB Venture Investment Fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	4,470	2,942
Acquisition (Disposal)	(4,470)
Share of net profit from associates and joint ventures		1,528
Ending		4,470
KT-CKP New Media Investment Fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	281	2,294
Acquisition (Disposal)	(174)	(1,229)
Share of net profit from associates and joint ventures	27	(784)
Ending	134	281
Others [Member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	56,785	81,728
Acquisition (Disposal)	(7,867)	2,466
Share of net profit from associates and joint ventures	7,241	8,607
Others	(11,866)	(36,016)
Ending	44,293	56,785
KT-IBKC future investment fund [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	9,961	10,825
Acquisition (Disposal)	3,750	(1,050)
Share of net profit from associates and joint ventures	389	1,028
Others		(842)
Ending	14,100	9,961
K Bank Inc. [member]
Disclosure Of Associates And Joint Ventures [Line Items]
Beginning	52,655	42,108
Acquisition (Disposal)	21,782	26,725
Share of net profit from associates and joint ventures	(28,865)	(19,504)
Others	(414)	3,326
Ending	₩ 45,158	₩ 52,655

X

- Definition

The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2019-01-01
-Paragraph 10
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2019-en-r&anchor=para_10&doctype=Standard
-URIDate 2019-03-27

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- Definition

The entity's share of the profit (loss) from continuing operations of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Continuing operations [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss) from continuing operations]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2019-01-01
-Paragraph B16
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2019-en-r&anchor=para_B16_a&doctype=Appendix&subtype=B
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- Definition

Acquisition (disposal) of investments in subsidiaries, joint ventures and associates.

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- Definition

The increase (decrease) in Investments in Associates and Joint ventures resulting from other movements.

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