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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.

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