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Sensitivity analysis for Foreign currency exchange rates (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Increase (decrease) of income before income tax    
Disclosure of Sensitivity analysis for Foreign currency exchange rates [Line Items]    
10% Increase ₩ (1,336,821) ₩ (1,197,530)
10% Decrease 1,336,821 1,197,530
Increase (decrease) of shareholder's equity    
Disclosure of Sensitivity analysis for Foreign currency exchange rates [Line Items]    
10% Increase [1] (1,336,821) (1,197,530)
10% Decrease [1] ₩ 1,336,821 ₩ 1,197,530
[1] The effect on the shareholders' equity excluding the impact of income taxes.