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Other Financial Assets and Liabilities - Summary of Valuation Gain and Loss on Financial Liabilities at Fair Value Through Profit or Loss (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial liabilities [line items]      
Derivative liabilities held for trading ₩ 38 ₩ 7,758  
Valuation gain on financial liabilities [member]      
Disclosure of financial liabilities [line items]      
Derivative liabilities held for trading 78    
Valuation loss on financial liabilities [member]      
Disclosure of financial liabilities [line items]      
Derivative liabilities held for trading ₩ 2,014 ₩ 2,707 ₩ 3,078