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Reconciliation of changes in fair value measurement, assets (Details) - At fair value - Level 3 - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Financial assets at fair value through profit or loss, category [Member]
Reconciliation of changes in fair value measurement, assets [Line Items]
Beginning balance	₩ 5,156	₩ 5,052
Changes in fair value measurement, assets
Acquisition	359	40
Reclassified category	0	0
Valuation	623	64
Disposal	(446)	0
Foreign currency translation	0	0
Ending balance	5,692	5,156
Financial assets at fair value through other comprehensive income [Member]
Reconciliation of changes in fair value measurement, assets [Line Items]
Beginning balance	177,968	189,439
Changes in fair value measurement, assets
Acquisition	2,900	1,876
Reclassified category	0	0
Valuation	(23,128)	3,715
Disposal	(1)	(19,315)
Foreign currency translation	6,150	2,253
Ending balance	₩ 163,889	₩ 177,968

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- References

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- Definition

The gains (losses) including exchange differences recognised in other comprehensive income on the fair value measurement of assets. [Refer: At fair value [member]; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2020-01-01
-Paragraph 93
-Subparagraph e
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_ii&doctype=Standard
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- Definition

The increase in the fair value measurement of assets resulting from purchases of those assets. [Refer: At fair value [member]]

+ References

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-Name IFRS
-Number 13
-IssueDate 2020-01-01
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-Clause iii
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The decrease in the fair value measurement of assets resulting from sales. [Refer: At fair value [member]]

+ References

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-Name IFRS
-Number 13
-IssueDate 2020-01-01
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The amount of transfers of assets into Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

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