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Sensitivity analysis for Interest rates (Details) - KRW (₩)
₩ in Millions

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

Increase (decrease) of income before income tax

Disclosure of Sensitivity analysis for Interest rates [Line Items]

1% Increase

₩ (23,831)

₩ (27,198)

1% Decrease

23,831

27,198

Increase (decrease) of shareholder's equity

Disclosure of Sensitivity analysis for Interest rates [Line Items]

1% Increase

^[1]

(23,831)

(27,198)

1% Decrease

^[1]

₩ 23,831

₩ 27,198

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