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Risk Management - Summary of Sensitivity Analysis for Actuarial Assumptions (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2023
Dec. 31, 2022
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 ₩ 29,993 ₩ 27,495
1% Decrease 29,993 27,495
Actuarial assumption of expected rates of salary increases    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
1% Increase 392,392 321,930
1% Decrease (361,359) (283,658)
Actuarial assumption of discount rates    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
1% Increase (371,103) (289,229)
1% Decrease ₩ 415,361 ₩ 337,033