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Income and expenses on investment property (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income and expenses on investment property [Abstract]    
Rental income ₩ 9,494 ₩ 9,581
Operating and maintenance expenses related to rental income (923) (1,172)
Rental income from investment property, net of direct operating expense ₩ 8,571 ₩ 8,409