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Lease - Summary of Changes in Lease Liabilities (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure - Changes in lease liabilities [Abstract] |  |  |
Beginning balance |  | ₩ 4,621,096 | ₩ 5,070,133
Increase |  | 73,090 | 280,114
Decrease |  | (665,687) | (725,759)
Interest expenses |  | 93,651 | 111,782
Others | [1] | 288,353 | (115,174)
Ending balance |  | ₩ 4,410,503 | ₩ 4,621,096
[1] | Including translation effect of foreign currency lease liabilities and others.

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- Definition The amount of interest expense on lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_b&doctype=Standard -URIDate 2021-03-24 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_47_b&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_LeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Decrease through leases liabilities except interest expense on lease liabilities. + References No definition available. + Details
Name: | kep_DecreaseThroughLeasesLiabilitiesExceptInterestExpenseOnLeaseLiabilities
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | kep_DisclosureOfChangesInLeaseLiabilitiesAbstract
Namespace Prefix: | kep_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Increase decrease through effect of other changes lease liabilities. + References No definition available. + Details
Name: | kep_IncreaseDecreaseThroughEffectOfOtherChangesLeaseLiabilities
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Increase leases liabilities. + References No definition available. + Details
Name: | kep_IncreaseLeasesLiabilities
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration