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Financial Risk Management - Summary of Group's Recognized Financial Liabilities Subject to Enforceable Master Netting Arrangements or Similar Agreements (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of offsetting of financial liabilities [Line Items]    
Gross liabilities ₩ 84,178 ₩ 98,144
Gross assets offset (14) (1)
Net amounts presented in the statement of financial position 84,164 98,143
Amounts not offset, Financial instruments (82,130) (96,238)
Amounts not offset, Cash collateral 0 0
Net amount 2,034 1,905
Trade payables [member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross liabilities 65,669 78,317
Gross assets offset (13)  
Net amounts presented in the statement of financial position 65,656 78,317
Amounts not offset, Financial instruments (63,628) (76,413)
Amounts not offset, Cash collateral 0 0
Net amount 2,028 1,904
Other [member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross liabilities 18,509 19,827
Gross assets offset (1) (1)
Net amounts presented in the statement of financial position 18,508 19,826
Amounts not offset, Financial instruments (18,502) (19,825)
Amounts not offset, Cash collateral 0 0
Net amount ₩ 6 ₩ 1