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Changes in finance lease liabilities (Details) ₩ in Millions	Dec. 31, 2017 KRW (₩)
Disclosure - Changes in finance lease liabilities [Abstract]
Cash flow	₩ (122,919)
Acquisition of finance lease assets	₩ 0

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- References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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No definition available.

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Namespace Prefix:	kep_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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No definition available.

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Name:	kep_DisclosureOfChangesInFinanceLeaseLiabilitiesAbstract
Namespace Prefix:	kep_
Data Type:	xbrli:stringItemType
Balance Type:	na
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