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Sensitivity analysis for electricity 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 electricity rates [Line Items]

1% Increase

₩ 557,310

₩ 559,390

1% Decrease

(557,310)

(559,390)

Increase (decrease) of shareholder's equity

Disclosure of Sensitivity analysis for electricity rates [Line Items]

1% Increase

^[1]

557,310

559,390

1% Decrease

^[1]

₩ (557,310)

₩ (559,390)

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