Finance Income and Finance Costs - Finance Income and Costs Recognized in Other Comprehensive Income or Loss (Detail) - KRW (₩) ₩ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Analysis of income and expense [abstract]
Foreign currency translation differences for foreign operations	₩ 106,690	₩ (19,987)	₩ (231,738)
Finance income (costs) recognized in other comprehensive income (loss) after tax	₩ 106,690	₩ (19,987)	₩ (231,738)

The amount of other comprehensive income, before tax, related to exchange differences on translation of financial statements of foreign operations. [Refer: Other comprehensive income, before tax]

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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