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Long-term and short-term financial instruments (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Short-term financial instruments |  |
Long / short-term financial instruments [Line Items] |  |
Time deposits | ₩ 996,265 | ₩ 1,034,971
CP | 0 | 40,000
CD | 50,000 | 15,000
RP | 203,008 | 40,000
Others | 234,209 | 222,000
Long / short-term financial instruments | 1,483,482 | 1,351,971
Long-term financial instruments |  |
Long / short-term financial instruments [Line Items] |  |
Time deposits | 160,433 | 257,857
CP | 0 | 0
CD | 0 | 0
RP | 0 | 0
Others | 418,188 | 350,399
Long / short-term financial instruments | ₩ 578,621 | ₩ 608,256

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- 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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- 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_LongShortTermFinancialInstrumentsCP
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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- 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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- References No definition available. + Details
Name: | kep_LongShortTermFinancialInstrumentsRP
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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: |

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