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Hybrid bond (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Hybrid bond [Line Items] |  |
Amount | ₩ 398,910 | ₩ 398,910
Korea South-East Power Co., Ltd. | 1st bond-type hybrid bond |  |
Hybrid bond [Line Items] |  |
Issue date | Dec. 07, 2012 | Dec. 07, 2012
Maturity date | Dec. 06, 2042 | Dec. 06, 2042
Yield (%) | 4.38% | 4.38%
Amount | ₩ 170,000 | ₩ 170,000
Korea South-East Power Co., Ltd. | 2nd bond-type hybrid bond |  |
Hybrid bond [Line Items] |  |
Issue date | Dec. 07, 2012 | Dec. 07, 2012
Maturity date | Dec. 06, 2042 | Dec. 06, 2042
Yield (%) | 4.44% | 4.44%
Amount | ₩ 230,000 | ₩ 230,000
Expense of issuance |  |
Hybrid bond [Line Items] |  |
Amount | ₩ (1,090) | ₩ (1,090)

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