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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, 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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- 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 -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 93 -Subparagraph e -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_iii&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 93 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_iv&doctype=Standard -URIDate 2020-01-01 + Details
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