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Risk Management - Summary of Sensitivity Analysis for Provisions Assumptions (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
PCBs | Discount rate |  |
Disclosure of Sensitivity analysis for provisions assumptions [Line Items] |  |
0.1% Increase | ₩ (222) | ₩ (292)
0.1% Decrease | 223 | 293
PCBs | Inflation rate |  |
Disclosure of Sensitivity analysis for provisions assumptions [Line Items] |  |
0.1% Increase | 224 | 295
0.1% Decrease | (224) | (294)
Nuclear plants | Discount rate |  |
Disclosure of Sensitivity analysis for provisions assumptions [Line Items] |  |
0.1% Increase | (369,540) | (326,926)
0.1% Decrease | 381,026 | 336,928
Nuclear plants | Inflation rate |  |
Disclosure of Sensitivity analysis for provisions assumptions [Line Items] |  |
0.1% Increase | 403,420 | 357,676
0.1% Decrease | (391,754) | (347,450)
Spent fuel | Discount rate |  |
Disclosure of Sensitivity analysis for provisions assumptions [Line Items] |  |
0.1% Increase | (51,430) | (51,558)
0.1% Decrease | 53,438 | 53,571
Spent fuel | Inflation rate |  |
Disclosure of Sensitivity analysis for provisions assumptions [Line Items] |  |
0.1% Increase | 54,210 | 54,345
0.1% Decrease | ₩ (52,245) | ₩ (52,375)

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