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Other-Financial Assets : Changes in the allowance for doubtful accounts of Loans and receivables (Details) ₩ in Millions	12 Months Ended
	Dec. 31, 2017 KRW (₩)
Allowance for doubtful accounts [Abstract]
Beginning balance	₩ 4,532
Bad debt expense	2,465
Other	1,951
Ending balance	₩ 8,948

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Balance Type:	na
Period Type:	duration

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Namespace Prefix:	kep_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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