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Changes in the allowance for doubtful accounts of finance lease receivables (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2018 KRW (₩)
Changes in the allowance for doubtful accounts of finance lease receivables [Abstract]
Beginning balance	₩ 0
Bad debt expense	1,133
Write-off	0
Other	0
Ending balance	₩ 1,133

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- References

No definition available.

+ Details

Name:	kep_AllowanceForDoubtfulAccountsFinanceLeaseReceivables
Namespace Prefix:	kep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

Name:	kep_AllowanceForDoubtfulAccountsFinanceLeaseReceivablesBadDebtExpense
Namespace Prefix:	kep_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	kep_AllowanceForDoubtfulAccountsFinanceLeaseReceivablesOther
Namespace Prefix:	kep_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	kep_AllowanceForDoubtfulAccountsFinanceLeaseReceivablesWriteOff
Namespace Prefix:	kep_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	kep_ChangesInTheAllowanceForDoubtfulAccountsOfFinanceLeaseReceivablesAabstract
Namespace Prefix:	kep_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration