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Details of expense relating to defined benefit plans by nature (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure - Details of expense relating to defined benefit plans by nature [Abstract] |  |  |
Defined benefit allocated to Cost of sales | ₩ 308,672 | ₩ 332,249 | ₩ 312,391
Defined benefit allocated to Selling, general and administrative expense | 51,903 | 59,111 | 61,362
Defined benefit allocated to others | 54,109 | 48,622 | 47,963
Defined benefit | ₩ 414,684 | ₩ 439,982 | ₩ 421,716

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- References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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

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

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

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- References No definition available. + Details
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