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Litigation Case (Details)
₩ in Millions
Dec. 31, 2019
KRW (₩)
₩ / shares
Dec. 31, 2018
KRW (₩)
₩ / shares
As the defendant    
Litigation Case [Line Items]    
Number of cases | ₩ / shares 586 570
Claim amount | ₩ ₩ 697,835 ₩ 673,882
As the plaintiff    
Litigation Case [Line Items]    
Number of cases | ₩ / shares 199 174
Claim amount | ₩ ₩ 707,287 ₩ 793,491