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Risk Management - Summary of Sensitivity Analysis for Electricity Rates (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Increase (decrease) of profit before income tax |  |  |
Disclosure of Sensitivity analysis for electricity rates [Line Items] |  |  |
1% Increase |  | ₩ 661,990 | ₩ 573,086
1% Decrease |  | (661,990) | (573,086)
Increase (decrease) of shareholder's equity |  |  |
Disclosure of Sensitivity analysis for electricity rates [Line Items] |  |  |
1% Increase | [1] | 661,990 | 573,086
1% Decrease | [1] | ₩ (661,990) | ₩ (573,086)
[1] | The effect on the equity excluding the impact of income taxes.

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