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Risk Management - Summary of Fair Value Measurement of Liabilities (Details) - At fair value - KRW (₩)
₩ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of fair value measurement of liabilities [line items]    
Derivative liabilities ₩ 78,031 ₩ 365,119
Level 1    
Disclosure of fair value measurement of liabilities [line items]    
Derivative liabilities 0 0
Level 2    
Disclosure of fair value measurement of liabilities [line items]    
Derivative liabilities 78,031 365,119
Level 3    
Disclosure of fair value measurement of liabilities [line items]    
Derivative liabilities ₩ 0 ₩ 0