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Business Combination - Summary of Net cash Outflows From The Business Combination (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of Net cash outflows from the business combination [Abstract] |  |
Cash paid for the acquisition | ₩ 10,000 | ₩ 156,700
Less : Cash and cash equivalents received | 0 | (2,389)
Net cash outflows from the business combination | ₩ 10,000 | ₩ 154,311

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- Definition Cash acquired from acquisition. + References No definition available. + Details
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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:stringItemType
Balance Type: | na
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- Definition Payments to acquire businesses gross. + References No definition available. + Details
Name: | kep_PaymentsToAcquireBusinessesGross
Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Payments to acquire businesses net of cash acquired. + References No definition available. + Details
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Namespace Prefix: | kep_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration