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Long-term and short-term financial instruments (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Short-term financial instruments |  |
Long / short-term financial instruments [Line Items] |  |
Time deposits | ₩ 1,034,971 | ₩ 1,602,285
CP | 40,000 | 0
CD | 15,000 | 10,000
RP | 40,000 | 0
Others | 222,000 | 257,001
Long / short-term financial instruments | 1,351,971 | 1,869,286
Long-term financial instruments |  |
Long / short-term financial instruments [Line Items] |  |
Time deposits | 257,857 | 63,358
CP | 0 | 0
CD | 0 | 0
RP | 0 | 0
Others | 350,399 | 385,383
Long / short-term financial instruments | ₩ 608,256 | ₩ 448,741

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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

X
- 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: |