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Details of the fair value of plan assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of fair value of plan assets [Abstract]    
Equity instruments ₩ 96,823 ₩ 79,204
Debt instruments 510,184 517,040
Bank deposit 275,518 293,477
Others 892,806 585,920
Plan assets ₩ 1,775,331 ₩ 1,475,641