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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, 2024 | Dec. 31, 2023
Increase (decrease) of profit before income tax |  |  |
Disclosure of Sensitivity analysis for electricity rates [Line Items] |  |  |
1% Increase |  | ₩ 888,898 | ₩ 829,548
1% Decrease |  | (888,898) | (829,548)
Increase (decrease) of shareholder's equity |  |  |
Disclosure of Sensitivity analysis for electricity rates [Line Items] |  |  |
1% Increase | [1] | 888,898 | 829,548
1% Decrease | [1] | ₩ (888,898) | ₩ (829,548)
[1] | The effect on the equity excluding the impact of income taxes.

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