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Reconciliation of changes in fair value measurement, assets (Details) - At fair value [Member] - Level 3 [Member] - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of changes in fair value measurement, assets [Line Items]
Beginning balance	₩ 269,461	₩ 180,390
Changes in fair value measurement, assets [Abstract]
Acquisition	0	0
Reclassified category	(92,128)	98,472
Valuation	(6,201)	(9,401)
Disposal	0	0
Foreign currency translation	2,166	0
Ending balance	₩ 173,298	₩ 269,461

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The gains (losses) 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 2017-01-01
-Paragraph 93
-Subparagraph e
-Clause ii
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The increase in the fair value measurement of assets resulting from purchases of those assets. [Refer: At fair value [member]]

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The decrease in the fair value measurement of assets resulting from sales. [Refer: At fair value [member]]

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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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