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Sensitivity analysis for Interest 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 Interest rates [Line Items]

1% Increase

₩ (26,138)

₩ (25,167)

1% Decrease

26,138

25,167

Increase (decrease) of shareholder's equity

Disclosure of Sensitivity analysis for Interest rates [Line Items]

1% Increase

^[1]

(26,138)

(25,167)

1% Decrease

^[1]

₩ 26,138

₩ 25,167

[1]	The effect on the shareholders' equity excluding the impact of income taxes.