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Employment Benefits - Summary of Remeasurement Components Recognized in Other Comprehensive Income (loss) (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Changes in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income [abstract]    
Actuarial gain from changes in financial assumptions ₩ 429,810 ₩ (967,366)
Experience adjustments (20,175) (45,361)
Expected return (4,777) 11,609
Total loss (gain) on remeasurement, net defined benefit liability (asset) ₩ 404,858 ₩ (1,001,118)