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Risk Management - Summary of Sensitivity Analysis for Interest Rates (Parenthetical) (Details) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure Of Sensitivity Analysis For Interest Rates [Line Items] |  |
Percentage of increase in interest rates | 1.00% | 1.00%
Percentage of decrease in interest rates | 1.00% | 1.00%

X
- Definition Disclosure of sensitivity analysis for interest 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

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

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