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Segment Information - Summary of Segment Information (Parenthetical) (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]    
Long lived assets ₩ 22,176,723 ₩ 20,316,306
ICT [member]    
Disclosure of operating segments [line items]    
Long lived assets ₩ 13,687,834