XML 131 R115.htm IDEA: XBRL DOCUMENT
v3.21.1

Operating segments (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of operating segments [Line Items] |  |  |
Total segment revenue | ₩ 57,925,837 | ₩ 58,568,082 | ₩ 60,033,062
Intersegment revenue | 0 | 0 | 0
Revenue from external customers | 57,925,837 | 58,568,082 | 60,033,062
Depreciation and amortisation | 11,548,019 | 11,128,740 | 10,024,794
Interest income | 242,586 | 268,118 | 223,767
Interest expense | 1,995,425 | 2,046,811 | 1,868,458
Employee benefit expense | 492,288 | 725,120 | 360,575
Loss on abandonment of property, plant and equipment | 255,346 | 364,233 | 481,176
Increase in provisions, net | 1,832,765 | 2,301,215 | 1,056,994
Operating profit (loss) | 4,096,620 | (1,707,527) | (685,109)
Finance income | 1,510,249 | 1,009,706 | 796,870
Finance expense | (2,896,443) | (2,782,156) | (2,470,743)
Profit (loss) related to associates and joint ventures | 281,107 | 214,139 | 358,163
Profit (loss) before income tax | 2,991,533 | (3,265,838) | (2,000,819)
Segment assets | 203,142,111 | 197,597,792 | 185,249,061
Investments in associates and joint ventures | 6,170,533 | 5,914,831 | 5,878,345
Acquisition of non-current assets | 13,401,665 | 14,229,785 | 12,377,457
Segment liabilities | 132,475,265 | 128,708,143 | 114,156,299
Operating segments |  |  |
Disclosure of operating segments [Line Items] |  |  |
Total segment revenue | 91,899,958 | 95,197,218 | 97,262,180
Intersegment revenue | 33,974,121 | 36,629,136 | 37,229,118
Revenue from external customers | 57,925,837 | 58,568,082 | 60,033,062
Depreciation and amortisation | 11,675,647 | 11,250,366 | 10,081,743
Interest income | 273,438 | 301,857 | 268,043
Interest expense | 2,027,897 | 2,081,559 | 1,912,094
Employee benefit expense | 541,893 | 737,207 | 391,055
Loss on abandonment of property, plant and equipment | 255,347 | 364,233 | 481,176
Increase in provisions, net | 2,002,416 | 2,553,019 | 1,049,005
Operating profit (loss) | 4,387,807 | (1,411,975) | (557,368)
Profit (loss) related to associates and joint ventures | 281,107 | 214,138 | 358,163
Segment assets | 241,913,304 | 235,492,772 | 223,823,428
Investments in associates and joint ventures | 6,170,533 | 5,914,831 | 5,878,345
Acquisition of non-current assets | 13,432,396 | 14,311,340 | 12,440,174
Segment liabilities | 133,818,362 | 130,033,377 | 115,812,546
Operating segments | Transmission and distribution |  |  |
Disclosure of operating segments [Line Items] |  |  |
Total segment revenue | 57,345,933 | 58,328,372 | 59,676,952
Intersegment revenue | 1,224,602 | 1,336,725 | 1,393,120
Revenue from external customers | 56,121,331 | 56,991,647 | 58,283,832
Depreciation and amortisation | 3,836,355 | 3,814,428 | 3,555,158
Interest income | 48,220 | 73,478 | 77,925
Interest expense | 737,973 | 777,120 | 708,329
Employee benefit expense | 190,302 | 298,144 | 144,180
Loss on abandonment of property, plant and equipment | 236,727 | 350,865 | 424,774
Increase in provisions, net | 731,194 | 987,828 | 580,931
Operating profit (loss) | 3,045,912 | (2,568,529) | (1,814,363)
Profit (loss) related to associates and joint ventures | 169,176 | 140,757 | 287,268
Segment assets | 113,115,667 | 109,809,254 | 107,486,379
Investments in associates and joint ventures | 4,204,090 | 3,716,931 | 3,671,897
Acquisition of non-current assets | 6,535,380 | 6,340,593 | 6,323,504
Segment liabilities | 59,772,046 | 58,350,681 | 53,404,610
Operating segments | Electric power generation (Nuclear) |  |  |
Disclosure of operating segments [Line Items] |  |  |
Total segment revenue | 9,938,941 | 8,937,026 | 8,858,717
Intersegment revenue | 9,817,147 | 8,908,803 | 8,833,787
Revenue from external customers | 121,794 | 28,223 | 24,930
Depreciation and amortisation | 3,564,120 | 3,227,695 | 3,088,019
Interest income | 25,581 | 37,277 | 30,422
Interest expense | 503,485 | 511,864 | 503,161
Employee benefit expense | 86,672 | 132,283 | 76,467
Loss on abandonment of property, plant and equipment | 0 | 0 | 38,886
Increase in provisions, net | 691,052 | 672,134 | 520,167
Operating profit (loss) | 1,168,833 | 782,511 | 357,401
Profit (loss) related to associates and joint ventures | (4,905) | (5,497) | 9,946
Segment assets | 61,850,865 | 59,562,190 | 55,792,704
Investments in associates and joint ventures | 116,867 | 59,081 | 43,038
Acquisition of non-current assets | 2,419,939 | 2,574,358 | 2,187,077
Segment liabilities | 35,652,467 | 33,909,152 | 30,484,104
Operating segments | Electric power generation (Non-nuclear) |  |  |
Disclosure of operating segments [Line Items] |  |  |
Total segment revenue | 20,329,611 | 24,254,957 | 25,204,085
Intersegment revenue | 19,552,376 | 23,472,153 | 24,389,816
Revenue from external customers | 777,235 | 782,804 | 814,269
Depreciation and amortisation | 4,034,024 | 3,955,333 | 3,269,023
Interest income | 20,843 | 35,626 | 29,313
Interest expense | 622,346 | 655,466 | 577,441
Employee benefit expense | 112,775 | 163,626 | 91,140
Loss on abandonment of property, plant and equipment | 17,679 | 13,364 | 17,516
Increase in provisions, net | 346,195 | 766,407 | (227,234)
Operating profit (loss) | (172,884) | 551,287 | 482,418
Profit (loss) related to associates and joint ventures | 115,096 | 77,641 | 58,993
Segment assets | 54,531,155 | 54,758,933 | 49,296,392
Investments in associates and joint ventures | 1,807,409 | 2,088,581 | 2,114,203
Acquisition of non-current assets | 3,758,795 | 4,955,784 | 3,435,222
Segment liabilities | 33,292,680 | 33,117,193 | 27,558,156
Operating segments | Plant maintenance & engineering service |  |  |
Disclosure of operating segments [Line Items] |  |  |
Total segment revenue | 2,703,472 | 2,627,539 | 2,526,126
Intersegment revenue | 2,283,333 | 2,254,841 | 2,170,959
Revenue from external customers | 420,139 | 372,698 | 355,167
Depreciation and amortisation | 119,056 | 125,546 | 114,030
Interest income | 11,789 | 14,214 | 12,505
Interest expense | 1,250 | 2,861 | 4,126
Employee benefit expense | 101,255 | 124,745 | 77,526
Loss on abandonment of property, plant and equipment | 0 | 0 | 0
Increase in provisions, net | 230,264 | 124,242 | 174,785
Operating profit (loss) | 197,553 | 312,341 | 314,755
Profit (loss) related to associates and joint ventures | 1,740 | 1,237 | 1,956
Segment assets | 3,492,571 | 3,528,879 | 3,431,068
Investments in associates and joint ventures | 42,167 | 50,238 | 49,207
Acquisition of non-current assets | 141,226 | 95,810 | 111,393
Segment liabilities | 1,061,949 | 1,124,855 | 1,200,390
Operating segments | Others |  |  |
Disclosure of operating segments [Line Items] |  |  |
Total segment revenue | 1,582,001 | 1,049,324 | 996,300
Intersegment revenue | 1,096,663 | 656,614 | 441,436
Revenue from external customers | 485,338 | 392,710 | 554,864
Depreciation and amortisation | 122,092 | 127,364 | 55,513
Interest income | 167,005 | 141,262 | 117,878
Interest expense | 162,843 | 134,248 | 119,037
Employee benefit expense | 50,889 | 18,409 | 1,742
Loss on abandonment of property, plant and equipment | 940 | 4 | 0
Increase in provisions, net | 3,711 | 2,408 | 356
Operating profit (loss) | 148,393 | (489,585) | 102,421
Profit (loss) related to associates and joint ventures | 0 | 0 | 0
Segment assets | 8,923,046 | 7,833,516 | 7,816,885
Investments in associates and joint ventures | 0 | 0 | 0
Acquisition of non-current assets | 577,056 | 344,795 | 382,978
Segment liabilities | 4,039,220 | 3,531,496 | 3,165,286
Material reconciling items |  |  |
Disclosure of operating segments [Line Items] |  |  |
Total segment revenue | (33,974,121) | (36,629,136) | (37,229,118)
Intersegment revenue | (33,974,121) | (36,629,136) | (37,229,118)
Revenue from external customers | 0 | 0 | 0
Depreciation and amortisation | (127,628) | (121,626) | (56,949)
Interest income | (30,852) | (33,739) | (44,276)
Interest expense | (32,472) | (34,748) | (43,636)
Employee benefit expense | (49,605) | (12,087) | (30,480)
Loss on abandonment of property, plant and equipment | 0 | 0 | 0
Increase in provisions, net | (169,651) | (251,804) | 7,989
Operating profit (loss) | (291,187) | (295,552) | (127,741)
Profit (loss) related to associates and joint ventures | 0 | 0 | 0
Segment assets | (38,771,193) | (37,894,980) | (38,574,367)
Investments in associates and joint ventures | 0 | 0 | 0
Acquisition of non-current assets | (30,731) | (81,555) | (62,717)
Segment liabilities | (1,343,097) | (1,325,234) | ₩ (1,656,247)
Elimination of intersegment amounts |  |  |
Disclosure of operating segments [Line Items] |  |  |
Segment assets | (39,762,888) | (39,207,636) |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | (30,731) | (81,555) |
Segment liabilities | (6,749,728) | (6,654,717) |
Equity method adjustment |  |  |
Disclosure of operating segments [Line Items] |  |  |
Segment assets | 1,372,001 | 1,791,844 |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | 0 | 0 |
Segment liabilities | 0 | 0 |
Deferred taxes |  |  |
Disclosure of operating segments [Line Items] |  |  |
Segment assets | 47,664 | 2,048 |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | 0 | 0 |
Segment liabilities | 5,417,629 | 5,329,158 |
Others |  |  |
Disclosure of operating segments [Line Items] |  |  |
Profit (loss) before income tax |  | (481,236) |
Segment assets | (427,970) | 0 |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | 0 | ₩ 325 |
Segment liabilities | ₩ (10,998) |  |

X
- Definition The amount of additions to non-current assets other than financial instruments, deferred tax assets, net defined benefit assets and rights arising under insurance contracts. [Refer: Deferred tax assets; Financial instruments, class [member]; Non-current assets; Types of insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 24 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_24_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_28_e&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_AdditionsToNoncurrentAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of a present economic resource controlled by the entity as a result of past events. Economic resource is a right that has the potential to produce economic benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 28 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_28_c&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_b&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e&doctype=Standard -URIDate 2020-01-01 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 23 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_23&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_Assets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of depreciation and amortisation expense. Depreciation and amortisation are the systematic allocations of depreciable amounts of assets over their useful lives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 23 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_23_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_28_e&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B13 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B13_d&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_102&doctype=Standard -URIDate 2020-01-01 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_99&doctype=Standard -URIDate 2020-01-01 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_104&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_DepreciationAndAmortisationExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition The amount of costs associated with financing activities of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 82 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_82_b&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_FinanceCosts
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of income associated with interest and other financing activities of the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_FinanceIncome
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of expense arising from interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 23 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_23_d&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_28_e&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B13 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B13_f&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
Name: | ifrs-full_InterestExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_24_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B16&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_e&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_InvestmentAccountedForUsingEquityMethod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of a present obligation of the entity to transfer an economic resource as a result of past events. Economic resource is a right that has the potential to produce economic benefits. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_b&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2020-01-01 -Paragraph 93 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 28 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_28_d&doctype=Standard -URIDate 2020-01-01 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 23 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_23&doctype=Standard -URIDate 2020-01-01 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_Liabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of post-employment benefit expense relating to defined benefit plans. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 5 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_5&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_PostemploymentBenefitExpenseDefinedBenefitPlans
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The profit (loss) before tax expense or income. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 28 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_28_b&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 23 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_23&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_103&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_102&doctype=Standard -URIDate 2020-01-01 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2020-01-01 -Paragraph 33 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2020-en-r&anchor=para_33_b_i&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ProfitLossBeforeTax
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The profit (loss) from operating activities of the entity. [Refer: Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 32 -IssueDate 2020-01-01 -Paragraph IE33 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=32&code=ifrs-tx-2020-en-r&anchor=para_IE33&doctype=Illustrative%20Examples -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_85&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ProfitLossFromOperatingActivities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The income arising in the course of an entity's ordinary activities. Income is increases in assets, or decreases in liabilities, that result in increases in equity, other than those relating to contributions from holders of equity claims. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 28 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_28_a&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 23 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_23_a&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 32 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_32&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 33 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_33_a&doctype=Standard -URIDate 2020-01-01 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 34 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_34&doctype=Standard -URIDate 2020-01-01 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 82 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_82_a&doctype=Standard -URIDate 2020-01-01 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 103 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_103&doctype=Standard -URIDate 2020-01-01 Reference 8: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_102&doctype=Standard -URIDate 2020-01-01 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 5 -IssueDate 2020-01-01 -Paragraph 33 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=5&code=ifrs-tx-2020-en-r&anchor=para_33_b_i&doctype=Standard -URIDate 2020-01-01 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B12 -Subparagraph b -Clause v -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B12_b_v&doctype=Appendix&subtype=B -URIDate 2020-01-01 Reference 11: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 12 -IssueDate 2020-01-01 -Paragraph B10 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_B10_b&doctype=Appendix&subtype=B -URIDate 2020-01-01 + Details
Name: | ifrs-full_Revenue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 23 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_23_g&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_28_e&doctype=Standard -URIDate 2020-01-01 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective on first application of IFRS 9 -Name IFRS -Number 4 -IssueDate 2020-01-01 -Paragraph 39M -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=4&code=ifrs-tx-2020-en-b&anchor=para_39M_b&doctype=Standard -URIDate 2020-01-01 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 82 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_82_c&doctype=Standard -URIDate 2020-01-01 + Details
Name: | ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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

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

X
- Definition Amount of interest income earned from interest bearing assets classified as other. + References No definition available. + Details
Name: | us-gaap_InterestIncomeOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_SegmentConsolidationItemsAxis=ifrs-full_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=kep_TransmissionAndDistributionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=kep_ElectricPowerGenerationNuclearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=kep_ElectricPowerGenerationNonNuclearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=kep_PlantMaintenanceEngineeringServiceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=ifrs-full_AllOtherSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentConsolidationItemsAxis=ifrs-full_MaterialReconcilingItemsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentConsolidationItemsAxis=ifrs-full_EliminationOfIntersegmentAmountsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentConsolidationItemsAxis=kep_EquityMethodAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentConsolidationItemsAxis=kep_DeferredTaxesAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentConsolidationItemsAxis=kep_OthersAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |