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Litigation Case (Details) ₩ in Millions	Dec. 31, 2018 KRW (₩) ₩ / shares	Dec. 31, 2017 KRW (₩) ₩ / shares
As the defendant
Litigation Case [Line Items]
Number of cases \| ₩ / shares	570	565
Claim amount \| ₩	₩ 673,882	₩ 477,719
As the plaintiff
Litigation Case [Line Items]
Number of cases \| ₩ / shares	174	185
Claim amount \| ₩	₩ 793,491	₩ 690,934