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Risk Management - Summary of Sensitivity Analysis for Electricity Rates (Parenthetical) (Details) | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Disclosure of Sensitivity analysis for electricity rates [Line Items] |  |
Percentage of increase in electricity rates | 1.00% | 1.00%
Percentage of decrease in electricity rates | 1.00% | 1.00%

X
- Definition Disclosure of Sensitivity analysis for electricity rates [line item]. + References No definition available. + Details
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Namespace Prefix: | kep_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of reasonably possible decrease in electricity rates. + References No definition available. + Details
Name: | kep_PercentageOfReasonablyPossibleDecreaseInElectricityRates
Namespace Prefix: | kep_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of reasonably possible increase in electricity rates. + References No definition available. + Details
Name: | kep_PercentageOfReasonablyPossibleIncreaseInElectricityRates
Namespace Prefix: | kep_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration