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Material Accounting Policies - Additional Information (Details) - Investment properties except for land [member] | 12 Months Ended
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Dec. 31, 2024
Bottom of range [member] |
Material Accounting Policies [Line Items] |
Investment property useful life (in years) | 8
Top of range [member] |
Material Accounting Policies [Line Items] |
Investment property useful life (in years) | 40

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- Definition Description of useful life used for investment property. [Refer: Investment property] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 40 -IssueDate 2024-01-01 -Paragraph 79 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2024-en-r&anchor=para_79_b&doctype=Standard -URIDate 2024-03-27 + Details
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Balance Type: | na
Period Type: | duration

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- Definition Material accounting policies. + 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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- Details
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Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=kep_InvestmentPropertyExcludingLandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |