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Reconciliation of changes in fair value measurement, assets (Details) - At fair value - Level 3 - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Financial assets available-for-sale, category [Member] |  |
Reconciliation of changes in fair value measurement, assets [Line Items] |  |
Beginning balance | ₩ 173,298 | ₩ 269,461
Changes in fair value measurement, assets |  |
Effect of change in accounting policy | 0 | 0
Acquisition | 0 | 0
Reclassified category | 0 | (92,128)
Valuation | 0 | (6,201)
Disposal | 0 | 0
Foreign currency translation | 0 | 2,166
Ending balance | 0 | 173,298
Financial assets at fair value through profit or loss, category [Member] |  |
Reconciliation of changes in fair value measurement, assets [Line Items] |  |
Beginning balance | 0 | 0
Changes in fair value measurement, assets |  |
Effect of change in accounting policy | 5,038 | 0
Acquisition | 0 | 0
Reclassified category | 0 | 0
Valuation | 14 | 0
Disposal | 0 | 0
Foreign currency translation | 0 | 0
Ending balance | 5,052 | 0
Financial assets at fair value through other comprehensive income [Member] |  |
Reconciliation of changes in fair value measurement, assets [Line Items] |  |
Beginning balance | 0 | 0
Changes in fair value measurement, assets |  |
Effect of change in accounting policy | 197,450 | 0
Acquisition | 0 | 0
Reclassified category | 0 | 0
Valuation | (11,744) | 0
Disposal | (326) | 0
Foreign currency translation | 4,059 | 0
Ending balance | ₩ 189,439 | ₩ 0

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- Definition 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 2018-01-01 -Paragraph 93 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e_ii&doctype=Standard -URIDate 2018-03-16 + Details
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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 2018-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e_iii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The decrease in the fair value measurement of assets resulting from sales. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e_iii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of transfers of assets into Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2018-01-01 -Paragraph 93 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=13&date=2018-03-01&anchor=para_93_e_iv&doctype=Standard -URIDate 2018-03-16 + Details
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