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Investments in Associates and Joint Ventures - Summary of Details of Associates (Detail)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Korea Information & Technology Fund [member]
Disclosure of associates [line items]
Percentage of ownership	33.30%	33.30%
Location	Korea
Date of financial statements	December 31	December 31
KT-IBKC future investment fund [member]
Disclosure of associates [line items]
Percentage of ownership	50.00%	50.00%
Location	Korea
Date of financial statements	December 31	December 31
KT-CKP New Media Investment Fund [member]
Disclosure of associates [line items]
Percentage of ownership		49.70%
Location	Korea
Date of financial statements	December 31	December 31
K Bank Inc. [member]
Disclosure of associates [line items]
Percentage of ownership	34.00%	10.00%
Location	Korea
Date of financial statements	December 31	December 31
Hyundai Robotics Co., Ltd. [member]
Disclosure of associates [line items]
Percentage of ownership	10.00%
Location	Korea
Date of financial statements	December 31	December 31

X

- Definition

The country in which an associate of the entity is incorporated. [Refer: Associates [member]]

+ References

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- Definition

The proportion of ownership interest in an associate attributable to the entity. [Refer: Associates [member]]

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