XML 262 R250.htm IDEA: XBRL DOCUMENT
v3.22.1

Risk Management - Summary of Maturity Analysis for Derivative Financial Assets and Liabilities (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | ₩ (76,319) | ₩ (366,732)
Derivative financial assets | 661,447 | 172,910
Net settlement | Not Designated as Hedging Instrument Trading |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | 0 | 0
Derivative financial assets | 0 | 0
Gross settlement | Not Designated as Hedging Instrument Trading |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | (47,508) | (158,688)
Derivative financial assets | 456,690 | 117,261
Gross settlement | Designated as Hedging Instrument |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | (28,811) | (208,044)
Derivative financial assets | 204,757 | 55,649
Less than 1 year |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | (9,183) | (50,635)
Derivative financial assets | 127,118 | 29,523
Less than 1 year | Net settlement | Not Designated as Hedging Instrument Trading |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | 0 | 0
Derivative financial assets | 0 | 0
Less than 1 year | Gross settlement | Not Designated as Hedging Instrument Trading |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | (6,628) | (12,777)
Derivative financial assets | 93,554 | 18,332
Less than 1 year | Gross settlement | Designated as Hedging Instrument |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | (2,555) | (37,858)
Derivative financial assets | 33,564 | 11,191
1~2 Years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | (5,592) | (62,355)
Derivative financial assets | 119,815 | 1,529
1~2 Years | Net settlement | Not Designated as Hedging Instrument Trading |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | 0 | 0
Derivative financial assets | 0 | 0
1~2 Years | Gross settlement | Not Designated as Hedging Instrument Trading |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | (4,954) | (22,827)
Derivative financial assets | 54,617 | 1,529
1~2 Years | Gross settlement | Designated as Hedging Instrument |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | (638) | (39,528)
Derivative financial assets | 65,198 | 0
2~5 Years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | (35,549) | (194,154)
Derivative financial assets | 305,423 | 86,443
2~5 Years | Net settlement | Not Designated as Hedging Instrument Trading |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | 0 | 0
Derivative financial assets | 0 | 0
2~5 Years | Gross settlement | Not Designated as Hedging Instrument Trading |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | (33,635) | (118,704)
Derivative financial assets | 202,663 | 45,237
2~5 Years | Gross settlement | Designated as Hedging Instrument |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | (1,914) | (75,450)
Derivative financial assets | 102,760 | 41,206
More than 5 years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | (25,995) | (59,588)
Derivative financial assets | 109,091 | 55,415
More than 5 years | Net settlement | Not Designated as Hedging Instrument Trading |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | 0 | 0
Derivative financial assets | 0 | 0
More than 5 years | Gross settlement | Not Designated as Hedging Instrument Trading |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | (2,291) | (4,380)
Derivative financial assets | 105,856 | 52,163
More than 5 years | Gross settlement | Designated as Hedging Instrument |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Derivative financial liabilities, undiscounted cash flows | (23,704) | (55,208)
Derivative financial assets | ₩ 3,235 | ₩ 3,252

X
- Definition The amount of financial assets classified as derivative instruments. [Refer: Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DerivativeFinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of contractual undiscounted cash flows in relation to derivative financial liabilities. [Refer: Derivative financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 39 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_39_b&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DerivativeFinancialLiabilitiesUndiscountedCashFlows
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfMaturityAnalysisForDerivativeFinancialLiabilitiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | kep_SettlementTypeAxis=kep_NetSettlementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kep_HedgingDesignationAxis=kep_NotDesignatedAsHedgingInstrumentTradingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kep_SettlementTypeAxis=kep_GrossSettlementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | kep_HedgingDesignationAxis=kep_DesignatedAsHedgingInstrumentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanTwoYearsAndNotLaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |