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Financial Risk Management - Summary of Group's Recognized Financial Assets Subject to Enforceable Master Netting Arrangements or Similar Agreements (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of offsetting of financial assets [line items]    
Gross assets   ₩ 85,058
Gross liabilities offset   (14)
Net amounts presented in the statement of financial position   85,044
Amounts not offset, Financial instruments   (82,130)
Amounts not offset, Cash collateral   0
Net amount   2,914
Trade receivables [member]    
Disclosure of offsetting of financial assets [line items]    
Gross assets ₩ 71,497 66,487
Gross liabilities offset (1) (1)
Net amounts presented in the statement of financial position 71,496 66,486
Amounts not offset, Financial instruments (67,421) (63,604)
Amounts not offset, Cash collateral 0 0
Net amount ₩ 4,075 2,882
Other Financial Assets1 [member]    
Disclosure of offsetting of financial assets [line items]    
Gross assets   18,571
Gross liabilities offset   (13)
Net amounts presented in the statement of financial position   18,558
Amounts not offset, Financial instruments   (18,526)
Amounts not offset, Cash collateral   0
Net amount   ₩ 32