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Related Parties - Summary of Borrowings Arising From Related Party Transactions (Details) - Korea Development Bank ₩ in Millions | 12 Months Ended
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Dec. 31, 2021 KRW (₩)
Disclosure of Borrowings transactions between related parties [Line Items] |
Beginning balance | ₩ 253,555
Changes in Borrowings transactions between related parties [Abstract] |
Borrowings | 206,829
Repayment | (112,342)
Others | 5,282
Ending balance | 353,324
Facility |
Disclosure of Borrowings transactions between related parties [Line Items] |
Beginning balance | 50,293
Changes in Borrowings transactions between related parties [Abstract] |
Borrowings | 56,906
Repayment | (10,863)
Others | 1,684
Ending balance | 98,020
Others |
Disclosure of Borrowings transactions between related parties [Line Items] |
Beginning balance | 2,946
Changes in Borrowings transactions between related parties [Abstract] |
Borrowings | 0
Repayment | (437)
Others | 0
Ending balance | 2,509
Operating funds |
Disclosure of Borrowings transactions between related parties [Line Items] |
Beginning balance | 144,300
Changes in Borrowings transactions between related parties [Abstract] |
Borrowings | 140,000
Repayment | (100,000)
Others | 0
Ending balance | 184,300
Syndicated Loans |
Disclosure of Borrowings transactions between related parties [Line Items] |
Beginning balance | 15,923
Changes in Borrowings transactions between related parties [Abstract] |
Borrowings | 0
Repayment | (1,042)
Others | (351)
Ending balance | 14,530
EBL |
Disclosure of Borrowings transactions between related parties [Line Items] |
Beginning balance | 40,093
Changes in Borrowings transactions between related parties [Abstract] |
Borrowings | 9,923
Repayment | 0
Others | 3,949
Ending balance | ₩ 53,965

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- Definition Amounts borrowings related party transactions. + References No definition available. + Details
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- Definition Borrowings transactions between related parties. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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- References No definition available. + Details
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- Definition Other increase decrease borrowings transactions between related parties. + References No definition available. + Details
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Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
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- Definition Repayment of borrowings transactions between related parties. + References No definition available. + Details
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Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=kep_KoreaDevelopmentBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=kep_FacilityLoan1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=kep_OtherLoan1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=kep_OperatingFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
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Namespace Prefix: |
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Period Type: |