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Other Financial Assets - Summary of Long-Term and Short-Term Financial Instruments (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Short-term financial instruments |  |
Long / short-term financial instruments [Line Items] |  |
Time deposits | ₩ 976,899 | ₩ 996,265
CD | 0 | 50,000
RP | 0 | 203,008
Others | 301,115 | 234,209
Long / short-term financial instruments | 1,278,014 | 1,483,482
Long-term financial instruments |  |
Long / short-term financial instruments [Line Items] |  |
Time deposits | 103,607 | 160,433
CD | 0 | 0
RP | 0 | 0
Others | 346,887 | 418,188
Long / short-term financial instruments | ₩ 450,494 | ₩ 578,621

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- Definition Long Short Term financial instruments. + References No definition available. + Details
Name: | kep_LongShortTermFinancialInstruments
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Long short term financial instruments CD. + References No definition available. + Details
Name: | kep_LongShortTermFinancialInstrumentsCD
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Long short term financial instruments others. + References No definition available. + Details
Name: | kep_LongShortTermFinancialInstrumentsOthers
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Long short term financial instruments RP. + References No definition available. + Details
Name: | kep_LongShortTermFinancialInstrumentsRP
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Long short term financial instruments time deposits. + References No definition available. + Details
Name: | kep_LongShortTermFinancialInstrumentsTimeDeposits
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=kep_ShortTermFinancialInstrumentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=kep_LongTermFinancialInstrumentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |