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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, 2019	Dec. 31, 2018
Financial assets at fair value through profit or loss, category [Member]
Reconciliation of changes in fair value measurement, assets [Line Items]
Beginning balance	₩ 5,052	₩ 0
Changes in fair value measurement, assets
Effect of change in accounting policy		5,038
Acquisition	40	0
Reclassified category	0	0
Valuation	64	14
Disposal	0	0
Foreign currency translation	0	0
Ending balance	5,156	5,052
Financial assets at fair value through other comprehensive income [Member]
Reconciliation of changes in fair value measurement, assets [Line Items]
Beginning balance	189,439	0
Changes in fair value measurement, assets
Effect of change in accounting policy		197,450
Acquisition	1,876	0
Reclassified category	0	0
Valuation	3,715	(11,744)
Disposal	(19,315)	(326)
Foreign currency translation	2,253	4,059
Ending balance	₩ 177,968	₩ 189,439

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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 2019-01-01
-Paragraph 93
-Subparagraph e
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_e_ii&doctype=Standard
-URIDate 2019-03-27

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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2019-01-01
-Paragraph 93
-Subparagraph e
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_e_iii&doctype=Standard
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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 2019-01-01
-Paragraph 93
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-Clause iii
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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]]

+ References

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