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Details of the fair value of plan assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of fair value of plan assets [Abstract]    
Equity instruments ₩ 189,235 ₩ 96,823
Debt instruments 648,265 510,184
Bank deposit 199,743 275,518
Others 1,074,070 892,806
Plan assets ₩ 2,111,313 ₩ 1,775,331