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Long-term and short-term financial instruments (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Short-term financial instruments |  |
Long / short-term financial instruments [Line Items] |  |
Time deposits | ₩ 1,602,285 | ₩ 1,479,034
ABCP | 0 | 145,000
CP | 0 | 58,050
CD | 10,000 | 10,000
RP | 0 | 10,000
Others | 257,001 | 0
Long / short-term financial instruments | 1,869,286 | 1,702,084
Long-term financial instruments |  |
Long / short-term financial instruments [Line Items] |  |
Time deposits | 63,358 | 2
ABCP | 0 | 65,600
CP | 0 | 0
CD | 0 | 0
RP | 0 | 1,634
Others | 385,383 | 475,194
Long / short-term financial instruments | ₩ 448,741 | ₩ 542,430

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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_LongShortTermFinancialInstrumentsABCP
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

X
- 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: |