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Income and expenses on investment property (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income and expenses on investment property [Abstract]    
Rental income ₩ 9,581 ₩ 9,460
Operating and maintenance expenses related to rental income (1,172) (678)
Rental income from investment property, net of direct operating expense ₩ 8,409 ₩ 8,782