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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, 2020
Dec. 31, 2019
Disclosure of offsetting of financial liabilities [Line Items]    
Gross liabilities ₩ 69,362 ₩ 84,178
Gross assets offset (1) (14)
Net amounts presented in the statement of financial position 69,361 84,164
Amounts not offset, Financial instruments (67,421) (82,130)
Amounts not offset, Cash collateral 0 0
Net amount 1,940 2,034
Trade payables [member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross liabilities 69,361 65,669
Gross assets offset   (13)
Net amounts presented in the statement of financial position 69,361 65,656
Amounts not offset, Financial instruments (67,421) (63,628)
Amounts not offset, Cash collateral 0 0
Net amount 1,940 2,028
Other [member]    
Disclosure of offsetting of financial liabilities [Line Items]    
Gross liabilities 1 18,509
Gross assets offset (1) (1)
Net amounts presented in the statement of financial position   18,508
Amounts not offset, Financial instruments   (18,502)
Amounts not offset, Cash collateral ₩ 0 0
Net amount   ₩ 6