The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Period Type:	instant

Income Tax Expense - Schedule of Changes in Deferred Income Tax Assets (Liabilities) (Parenthetical) (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]
Deferred tax liabilities		₩ 5
Investments in Subsidiaries
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]
Deferred tax liabilities	₩ 2,577