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Detailed information about intangible assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Changes in intangible assets other than goodwill      
Impairment loss ₩ 513,609 ₩ 8,112 ₩ 20
Intangible assets other than goodwill      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 1,225,942 1,187,121 1,187,121
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 1,225,942 1,187,121  
Changes in intangible assets other than goodwill      
Acquisition 229,426 110,587  
Disposal (8,321) (9)  
Amortization (156,915) (118,938)  
Impairment loss (513,609) [1] (8,140) [2]  
Others 293,453 [3] 55,321  
Ending balance 1,069,976 1,225,942 1,187,121
Intangible assets other than goodwill | Carrying Amount Other than Government Grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 1,239,036 1,201,860 1,201,860
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 1,239,036 1,201,860  
Changes in intangible assets other than goodwill      
Acquisition 229,426 110,587  
Disposal (8,321) (9)  
Amortization (157,952) (120,794)  
Impairment loss (513,609) [1] (8,939) [2]  
Others 294,231 [3] 56,331  
Ending balance 1,082,811 1,239,036 1,201,860
Intangible assets other than goodwill | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 3,069,716 2,897,446 2,897,446
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 3,069,716 2,897,446  
Changes in intangible assets other than goodwill      
Ending balance 3,597,314 3,069,716 2,897,446
Intangible assets other than goodwill | Accumulated amortization      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (1,805,784) (1,679,576) (1,679,576)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (1,805,784) (1,679,576)  
Changes in intangible assets other than goodwill      
Ending balance (1,967,732) (1,805,784) (1,679,576)
Intangible assets other than goodwill | Accumulated impairment [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (24,896) (16,010) (16,010)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (24,896) (16,010)  
Changes in intangible assets other than goodwill      
Ending balance (546,771) (24,896) (16,010)
Intangible assets other than goodwill | Government grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (13,094) (14,739) (14,739)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (13,094) (14,739)  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization 1,037 1,856  
Impairment loss 0 [1] 799 [2]  
Others (778) [3] (1,010)  
Ending balance (12,835) (13,094) (14,739)
Software      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 157,261 125,405 125,405
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 157,261 125,405  
Changes in intangible assets other than goodwill      
Acquisition 42,694 10,861  
Disposal (774) (1)  
Amortization (81,681) (53,501)  
Impairment loss 0 [1] 0 [2]  
Others 47,260 [3] 74,497  
Ending balance 164,760 157,261 125,405
Software | Carrying Amount Other than Government Grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 157,681 125,891 125,891
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 157,681 125,891  
Changes in intangible assets other than goodwill      
Acquisition 42,694 10,861  
Disposal (774) (1)  
Amortization (81,883) (53,755)  
Impairment loss 0 [1] 0 [2]  
Others 47,277 [3] 74,685  
Ending balance 164,995 157,681 125,891
Software | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 619,662 534,191 534,191
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 619,662 534,191  
Changes in intangible assets other than goodwill      
Ending balance 707,731 619,662 534,191
Software | Accumulated amortization      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (461,981) (408,300) (408,300)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (461,981) (408,300)  
Changes in intangible assets other than goodwill      
Ending balance (542,736) (461,981) (408,300)
Software | Government grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (420) (486) (486)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (420) (486)  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization 202 254  
Impairment loss 0 [1] 0 [2]  
Others (17) [3] (188)  
Ending balance (235) (420) (486)
Licences and franchises      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 0 0 0
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 0 0  
Changes in intangible assets other than goodwill      
Ending balance 0 0 0
Licences and franchises | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 3,398 3,398 3,398
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 3,398 3,398  
Changes in intangible assets other than goodwill      
Ending balance 3,398 3,398 3,398
Licences and franchises | Accumulated amortization      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (3,398) (3,398) (3,398)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (3,398) (3,398)  
Changes in intangible assets other than goodwill      
Ending balance (3,398) (3,398) (3,398)
Copyrights, patents rights and other industrial rights      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 67,112 23,981 23,981
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 67,112 23,981  
Changes in intangible assets other than goodwill      
Acquisition 171 28  
Disposal (325) 0  
Amortization (9,196) (8,665)  
Impairment loss 0 [1] (13) [2]  
Others (4,501) [3] 51,781  
Ending balance 53,261 67,112 23,981
Copyrights, patents rights and other industrial rights | Carrying Amount Other than Government Grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 67,112 23,981 23,981
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 67,112 23,981  
Changes in intangible assets other than goodwill      
Acquisition 171 28  
Disposal (325) 0  
Amortization (9,196) (8,665)  
Impairment loss 0 [1] (13) [2]  
Others (4,501) [3] 51,781  
Ending balance 53,261 67,112 23,981
Copyrights, patents rights and other industrial rights | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 97,033 43,857 43,857
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 97,033 43,857  
Changes in intangible assets other than goodwill      
Ending balance 102,828 97,033 43,857
Copyrights, patents rights and other industrial rights | Accumulated amortization      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (29,921) (19,876) (19,876)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (29,921) (19,876)  
Changes in intangible assets other than goodwill      
Ending balance (40,389) (29,921) (19,876)
Copyrights, patents rights and other industrial rights | Accumulated impairment [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 0 0 0
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 0 0  
Changes in intangible assets other than goodwill      
Ending balance (9,178) 0 0
Mining rights      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 534,524 539,633 539,633
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 534,524 539,633  
Changes in intangible assets other than goodwill      
Acquisition 8,742 29,687  
Disposal 0 0  
Amortization (7,186) (3,186)  
Impairment loss (513,519) [1] 0 [2]  
Others 21,162 [3] (31,610)  
Ending balance 43,723 534,524 539,633
Mining rights | Carrying Amount Other than Government Grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 534,524 539,633 539,633
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 534,524 539,633  
Changes in intangible assets other than goodwill      
Acquisition 8,742 29,687  
Disposal 0 0  
Amortization (7,186) (3,186)  
Impairment loss (513,519) [1] 0 [2]  
Others 21,162 [3] (31,610)  
Ending balance 43,723 534,524 539,633
Mining rights | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 561,945 553,876 553,876
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 561,945 553,876  
Changes in intangible assets other than goodwill      
Ending balance 584,969 561,945 553,876
Mining rights | Accumulated amortization      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (27,421) (14,243) (14,243)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (27,421) (14,243)  
Changes in intangible assets other than goodwill      
Ending balance (28,456) (27,421) (14,243)
Mining rights | Accumulated impairment [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 0 0 0
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 0 0  
Changes in intangible assets other than goodwill      
Ending balance (512,790) 0 0
Development expenditures      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 90,376 80,816 80,816
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 90,376 80,816  
Changes in intangible assets other than goodwill      
Acquisition 687 823  
Disposal 0 0  
Amortization (28,068) (25,509)  
Impairment loss (68) [1] 0 [2]  
Others 29,424 [3] 34,246  
Ending balance 92,351 90,376 80,816
Development expenditures | Carrying Amount Other than Government Grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 92,486 84,518 84,518
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 92,486 84,518  
Changes in intangible assets other than goodwill      
Acquisition 687 823  
Disposal 0 0  
Amortization (28,901) (27,100)  
Impairment loss (68) [1] 0 [2]  
Others 29,639 [3] 34,245  
Ending balance 93,843 92,486 84,518
Development expenditures | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 878,462 836,996 836,996
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 878,462 836,996  
Changes in intangible assets other than goodwill      
Ending balance 916,834 878,462 836,996
Development expenditures | Accumulated amortization      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (785,976) (752,478) (752,478)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (785,976) (752,478)  
Changes in intangible assets other than goodwill      
Ending balance (822,972) (785,976) (752,478)
Development expenditures | Accumulated impairment [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 0 0 0
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 0 0  
Changes in intangible assets other than goodwill      
Ending balance (19) 0 0
Development expenditures | Government grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (2,110) (3,702) (3,702)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (2,110) (3,702)  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization 833 1,591  
Impairment loss 0 [1] 0 [2]  
Others (215) [3] 1  
Ending balance (1,492) (2,110) (3,702)
Intangible assets under development      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 59,972 129,370 129,370
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 59,972 129,370  
Changes in intangible assets other than goodwill      
Acquisition 56,082 67,383  
Disposal 0 0  
Amortization 0 0  
Impairment loss 0 [1] (8,113) [2]  
Others (66,593) [3] (128,668)  
Ending balance 49,461 59,972 129,370
Intangible assets under development | Carrying Amount Other than Government Grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 70,536 139,910 139,910
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 70,536 139,910  
Changes in intangible assets other than goodwill      
Acquisition 56,082 67,383  
Disposal 0 0  
Amortization 0 0  
Impairment loss 0 [1] (8,912) [2]  
Others (66,128) [3] (127,845)  
Ending balance 60,490 70,536 139,910
Intangible assets under development | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 83,381 143,851 143,851
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 83,381 143,851  
Changes in intangible assets other than goodwill      
Ending balance 73,335 83,381 143,851
Intangible assets under development | Accumulated impairment [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (12,845) (3,941) (3,941)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (12,845) (3,941)  
Changes in intangible assets other than goodwill      
Ending balance (12,845) (12,845) (3,941)
Intangible assets under development | Government grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (10,564) (10,540) (10,540)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (10,564) (10,540)  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization 0 0  
Impairment loss 0 [1] 799 [2]  
Others (465) [3] (823)  
Ending balance (11,029) (10,564) (10,540)
Usage rights of donated assets and other      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 87,011 101,647 101,647
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 87,011 101,647  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization (15,632) (13,296)  
Impairment loss 0 [1] 0 [2]  
Others 121,782 [3] (1,340)  
Ending balance 193,161 87,011 101,647
Usage rights of donated assets and other | Carrying Amount Other than Government Grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 87,011 101,658 101,658
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 87,011 101,658  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization (15,632) (13,307)  
Impairment loss 0 [1] 0 [2]  
Others 121,782 [3] (1,340)  
Ending balance 193,161 87,011 101,658
Usage rights of donated assets and other | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 459,682 459,682 459,682
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 459,682 459,682  
Changes in intangible assets other than goodwill      
Ending balance 582,825 459,682 459,682
Usage rights of donated assets and other | Accumulated amortization      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (372,671) (358,024) (358,024)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (372,671) (358,024)  
Changes in intangible assets other than goodwill      
Ending balance (389,664) (372,671) (358,024)
Usage rights of donated assets and other | Government grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 0 (11) (11)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 0 (11)  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization 0 11  
Impairment loss 0 [1] 0 [2]  
Others 0 [3] 0  
Ending balance 0 0 (11)
Leasehold rights      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 5,552 5,044 5,044
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 5,552 5,044  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization (741) (667)  
Impairment loss 0 [1] 0 [2]  
Others 507 [3] 1,175  
Ending balance 5,318 5,552 5,044
Leasehold rights | Carrying Amount Other than Government Grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 5,552 5,044 5,044
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 5,552 5,044  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization (741) (667)  
Impairment loss 0 [1] 0 [2]  
Others 507 [3] 1,175  
Ending balance 5,318 5,552 5,044
Leasehold rights | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 25,482 24,306 24,306
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 25,482 24,306  
Changes in intangible assets other than goodwill      
Ending balance 25,989 25,482 24,306
Leasehold rights | Accumulated amortization      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (19,930) (19,262) (19,262)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (19,930) (19,262)  
Changes in intangible assets other than goodwill      
Ending balance (20,671) (19,930) (19,262)
Greenhouse gas emissions rights      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 7,050 0 0
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 7,050 0  
Changes in intangible assets other than goodwill      
Acquisition 118,743 0  
Disposal (7,058) 0  
Amortization 0 0  
Impairment loss 0 [1] 0 [2]  
Others (77,079) [3] 7,050  
Ending balance 41,656 7,050 0
Greenhouse gas emissions rights | Carrying Amount Other than Government Grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 7,050 0 0
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 7,050 0  
Changes in intangible assets other than goodwill      
Acquisition 118,743 0  
Disposal (7,058) 0  
Amortization 0 0  
Impairment loss 0 [1] 0 [2]  
Others (77,079) [3] 7,050  
Ending balance 41,656 7,050 0
Greenhouse gas emissions rights | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 7,050 0 0
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 7,050 0  
Changes in intangible assets other than goodwill      
Ending balance 41,656 7,050 0
Others      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 217,084 181,225 181,225
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 217,084 181,225  
Changes in intangible assets other than goodwill      
Acquisition 2,307 1,805  
Disposal (164) (8)  
Amortization (14,411) (14,114)  
Impairment loss (22) [1] (14) [2]  
Others 221,491 [3] 48,190  
Ending balance 426,285 217,084 181,225
Others | Carrying Amount Other than Government Grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 217,084 181,225 181,225
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 217,084 181,225  
Changes in intangible assets other than goodwill      
Acquisition 2,307 1,805  
Disposal (164) (8)  
Amortization (14,413) (14,114)  
Impairment loss (22) [1] (14) [2]  
Others 221,572 [3] 48,190  
Ending balance 426,364 217,084 181,225
Others | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 333,621 297,289 297,289
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 333,621 297,289  
Changes in intangible assets other than goodwill      
Ending balance 557,749 333,621 297,289
Others | Accumulated amortization      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (104,486) (103,995) (103,995)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (104,486) (103,995)  
Changes in intangible assets other than goodwill      
Ending balance (119,446) (104,486) (103,995)
Others | Accumulated impairment [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (12,051) (12,069) (12,069)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (12,051) (12,069)  
Changes in intangible assets other than goodwill      
Ending balance (11,939) (12,051) (12,069)
Others | Government grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 0 0 0
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 0 0  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization 2 0  
Impairment loss 0 [1] 0 [2]  
Others (81) [3] 0  
Ending balance (79) 0 0
Goodwill      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 2,582 2,582 2,582
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 2,582 2,582  
Changes in intangible assets other than goodwill      
Acquisition 95,395 0  
Disposal 0 0  
Amortization 0 0  
Impairment loss 0 0  
Others 0 0  
Ending balance 97,977 2,582 2,582
Goodwill | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 2,582 2,582 2,582
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 2,582 2,582  
Changes in intangible assets other than goodwill      
Ending balance ₩ 97,977 ₩ 2,582 ₩ 2,582
[1] KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd., 100% owned subsidiaries, performed an impairment test over the mining rights and the Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss.
[2] Includes W8,104 million of impairment loss on the intangible assets under development in relation to the technology development of heat transfer tube owned by KEPCO Nuclear Fuel Co., Ltd., 96.36% owned subsidiary, is.
[3] 'Others' include the business rights amounting to KRW172,434 million increased from the business combination between Korea East-West Power Co., Ltd. and Eumseong Natural Gas Power Co., Ltd. (see note 51)