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Risk Management - Summary of Sensitivity Analysis for Foreign Currency Exchange Rates (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Increase (decrease) of income before income tax    
Disclosure of sensitivity analysis for foreign currency exchange rates [Line Items]    
10% Increase ₩ (1,439,185) ₩ (1,336,821)
10% Decrease 1,439,185 1,336,821
Increase (decrease) of equity    
Disclosure of sensitivity analysis for foreign currency exchange rates [Line Items]    
10% Increase [1] (1,439,185) (1,336,821)
10% Decrease [1] ₩ 1,439,185 ₩ 1,336,821
[1] The effect on the shareholders’ equity excluding the impact of income taxes.