XML 187 R171.htm IDEA: XBRL DOCUMENT
v3.21.1

Principal assumptions on actuarial valuation (Details) - ₩ / shares | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disclosure - Principal assumptions on actuarial valuation [Abstract] |  |
Discount rate | 1.87%~2.12% | 1.92%~2.05%
Future salary and benefit levels | 4.28% | 4.39%
Weighted average duration | 10.77 | 10.95

X
- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_144&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ActuarialAssumptionOfExpectedRatesOfSalaryIncreases
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | ifrs-full_DisclosureOfDefinedBenefitPlansAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | kep_ActuarialAssumptionOfDiscountRatesString
Namespace Prefix: | kep_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | kep_WeightedAverageDuration
Namespace Prefix: | kep_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration