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Sensitivity analysis for electricity 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 electricity rates [Line Items]

1% Increase

₩ 568,420

₩ 546,499

1% Decrease

(568,420)

(546,499)

Increase (decrease) of shareholder's equity

Disclosure of Sensitivity analysis for electricity rates [Line Items]

1% Increase

^[1]

568,420

546,499

1% Decrease

^[1]

₩ (568,420)

₩ (546,499)

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