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Risk Management - Summary of Sensitivity Analysis for Actuarial Assumptions (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Increase movements in discount rate on plan asset 1.00% 1.00%
Decrease movements in discount rate on plan asset 1.00% 1.00%
1% Increase ₩ 36,602 ₩ 29,993
1% Decrease 29,993 36,602
Actuarial assumption of expected rates of salary increases    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
1% Increase 473,627 392,392
1% Decrease (413,799) (361,359)
Actuarial assumption of discount rates    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
1% Increase (429,517) (371,103)
1% Decrease ₩ 506,031 ₩ 415,361