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Litigation Case (Details)
₩ in Millions
Dec. 31, 2020
KRW (₩)
₩ / shares
Dec. 31, 2019
KRW (₩)
₩ / shares
As the defendant    
Litigation Case [Line Items]    
Number of cases | ₩ / shares 663 586
Claim amount | ₩ ₩ 550,535 ₩ 697,835
As the plaintiff    
Litigation Case [Line Items]    
Number of cases | ₩ / shares 200 199
Claim amount | ₩ ₩ 729,798 ₩ 707,287