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Investment Properties - Additional Information (Detail) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about investment property [abstract]    
Fair value of investment properties ₩ 1,755,600 ₩ 1,962,779
Rental income from investment properties ₩ 205,993 ₩ 184,670