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Earnings (Loss) Per Share - Summary of Diluted Earnings Loss Per Share (Details) - KRW (₩)
₩ / shares in Units, ₩ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Diluted earnings per share [abstract]      
Profit (loss) used in the calculation of total diluted earnings (loss) per share ₩ 3,491,698 ₩ (4,822,549) ₩ (24,466,853)
Weighted average number of common shares 641,964,077 641,964,077 641,964,077
Diluted weighted average number of shares 641,964,077 641,964,077 641,964,077
Diluted earnings (loss) per share ₩ 5,439 ₩ (7,512) ₩ (38,112)