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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, 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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- 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 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 + 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 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 -URIDate 2019-03-27 + 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 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 -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 93 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2019-en-r&anchor=para_93_e_iv&doctype=Standard -URIDate 2019-03-27 + Details
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