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Sensitivity analysis for Foreign currency exchange rates (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Increase (decrease) of income before income tax    
Disclosure of Sensitivity analysis for Foreign currency exchange rates [Line Items]    
10% Increase ₩ (1,197,530) ₩ (887,561)
10% Decrease 1,197,530 887,561
Increase (decrease) of shareholder's equity    
Disclosure of Sensitivity analysis for Foreign currency exchange rates [Line Items]    
10% Increase [1] (1,197,530) (887,561)
10% Decrease [1] ₩ 1,197,530 ₩ 887,561
[1] The effect on the shareholders' equity excluding the impact of income taxes.