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Lease - Summary of Liquidity Classification of Lease Liabilities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Lease liabilities [abstract]      
Current lease liabilities ₩ 583,558 ₩ 576,665  
Non-current lease liabilities 3,826,945 4,044,431  
Total lease liabilities ₩ 4,410,503 ₩ 4,621,096 ₩ 5,070,133