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Detailed information about intangible assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance ₩ 1,167,953 ₩ 1,228,524  
Changes in intangible assets other than goodwill      
Acquisition 120,560 324,821  
Disposal 9,707 8,321  
Amortization (170,466) (156,915)  
Impairment loss (3,599) (513,609) ₩ (8,112)
Others 49,155 293,453 [1]  
Ending balance 1,153,896 1,167,953 1,228,524
Intangible assets other than goodwill      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 1,069,976 1,225,942  
Changes in intangible assets other than goodwill      
Acquisition 120,371 229,426  
Disposal (9,707) (8,321)  
Amortization (170,466) (156,915)  
Impairment loss (3,599) (513,609)  
Others 49,155 293,453 [1]  
Ending balance 1,055,730 1,069,976 1,225,942
Intangible assets other than goodwill | Carrying Amount Other than Government Grants      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 1,082,811 1,239,036  
Changes in intangible assets other than goodwill      
Acquisition 120,371 229,426  
Disposal (9,707) (8,321)  
Amortization (172,022) (157,952)  
Impairment loss (3,599) (513,609)  
Others 50,333 294,231 [1]  
Ending balance 1,068,187 1,082,811 1,239,036
Intangible assets other than goodwill | Acquisition cost      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 3,597,314 3,069,716  
Changes in intangible assets other than goodwill      
Ending balance 3,769,026 3,597,314 3,069,716
Intangible assets other than goodwill | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (1,967,732) (1,805,784)  
Changes in intangible assets other than goodwill      
Ending balance (2,138,536) (1,967,732) (1,805,784)
Intangible assets other than goodwill | Accumulated impairment [Member]      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (546,771) (24,896)  
Changes in intangible assets other than goodwill      
Ending balance (562,303) (546,771) (24,896)
Intangible assets other than goodwill | Government grants      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (12,835) (13,094)  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization 1,556 1,037  
Impairment loss 0 0  
Others (1,178) (778) [1]  
Ending balance (12,457) (12,835) (13,094)
Software      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 164,760 157,261  
Changes in intangible assets other than goodwill      
Acquisition 14,101 42,694  
Disposal 0 (774)  
Amortization (77,402) (81,681)  
Impairment loss 0 0  
Others 50,568 47,260 [1]  
Ending balance 152,027 164,760 157,261
Software | Carrying Amount Other than Government Grants      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 164,995 157,681  
Changes in intangible assets other than goodwill      
Acquisition 14,101 42,694  
Disposal 0 (774)  
Amortization (77,501) (81,883)  
Impairment loss 0 0  
Others 50,568 47,277 [1]  
Ending balance 152,163 164,995 157,681
Software | Acquisition cost      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 707,731 619,662  
Changes in intangible assets other than goodwill      
Ending balance 775,667 707,731 619,662
Software | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (542,736) (461,981)  
Changes in intangible assets other than goodwill      
Ending balance (623,504) (542,736) (461,981)
Software | Government grants      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (235) (420)  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization 99 202  
Impairment loss 0 0  
Others 0 (17) [1]  
Ending balance (136) (235) (420)
Licences and franchises      
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      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 3,398 3,398  
Changes in intangible assets other than goodwill      
Ending balance 547 3,398 3,398
Licences and franchises | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (3,398) (3,398)  
Changes in intangible assets other than goodwill      
Ending balance (547) (3,398) (3,398)
Copyrights, patents rights and other industrial rights      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 53,261 67,112  
Changes in intangible assets other than goodwill      
Acquisition 369 171  
Disposal (390) (325)  
Amortization (8,352) (9,196)  
Impairment loss 0 0  
Others (1,972) (4,501) [1]  
Ending balance 42,916 53,261 67,112
Copyrights, patents rights and other industrial rights | Carrying Amount Other than Government Grants      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 53,261 67,112  
Changes in intangible assets other than goodwill      
Acquisition 369 171  
Disposal (390) (325)  
Amortization (8,352) (9,196)  
Impairment loss 0 0  
Others (1,972) (4,501) [1]  
Ending balance 42,916 53,261 67,112
Copyrights, patents rights and other industrial rights | Acquisition cost      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 102,828 97,033  
Changes in intangible assets other than goodwill      
Ending balance 101,866 102,828 97,033
Copyrights, patents rights and other industrial rights | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (40,389) (29,921)  
Changes in intangible assets other than goodwill      
Ending balance (49,772) (40,389) (29,921)
Copyrights, patents rights and other industrial rights | Accumulated impairment [Member]      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (9,178) 0  
Changes in intangible assets other than goodwill      
Ending balance (9,178) (9,178) 0
Mining rights      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 43,723 534,524  
Changes in intangible assets other than goodwill      
Acquisition 1,664 8,742  
Disposal 0 0  
Amortization (4,380) (7,186)  
Impairment loss 0 (513,519) [2]  
Others 1,383 21,162 [1]  
Ending balance 42,390 43,723 534,524
Mining rights | Carrying Amount Other than Government Grants      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 43,723 534,524  
Changes in intangible assets other than goodwill      
Acquisition 1,664 8,742  
Disposal 0 0  
Amortization (4,380) (7,186)  
Impairment loss 0 (513,519) [2]  
Others 1,383 21,162 [1]  
Ending balance 42,390 43,723 534,524
Mining rights | Acquisition cost      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 584,969 561,945  
Changes in intangible assets other than goodwill      
Ending balance 604,703 584,969 561,945
Mining rights | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (28,456) (27,421)  
Changes in intangible assets other than goodwill      
Ending balance (34,062) (28,456) (27,421)
Mining rights | Accumulated impairment [Member]      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (512,790) 0  
Changes in intangible assets other than goodwill      
Ending balance (528,251) (512,790) 0
Development expenditures      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 92,351 90,376  
Changes in intangible assets other than goodwill      
Acquisition 10,273 687  
Disposal 0 0  
Amortization (30,581) (28,068)  
Impairment loss 0 (68)  
Others 18,080 29,424 [1]  
Ending balance 90,123 92,351 90,376
Development expenditures | Carrying Amount Other than Government Grants      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 93,843 92,486  
Changes in intangible assets other than goodwill      
Acquisition 10,273 687  
Disposal 0 0  
Amortization (32,034) (28,901)  
Impairment loss 0 (68)  
Others 23,084 29,639 [1]  
Ending balance 95,166 93,843 92,486
Development expenditures | Acquisition cost      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 916,834 878,462  
Changes in intangible assets other than goodwill      
Ending balance 958,035 916,834 878,462
Development expenditures | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (822,972) (785,976)  
Changes in intangible assets other than goodwill      
Ending balance (862,850) (822,972) (785,976)
Development expenditures | Accumulated impairment [Member]      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (19) 0  
Changes in intangible assets other than goodwill      
Ending balance (19) (19) 0
Development expenditures | Government grants      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (1,492) (2,110)  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization 1,453 833  
Impairment loss 0 0  
Others (5,004) (215) [1]  
Ending balance (5,043) (1,492) (2,110)
Intangible assets under development      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 49,461 59,972  
Changes in intangible assets other than goodwill      
Acquisition 53,638 56,082  
Disposal 0 0  
Amortization 0 0  
Impairment loss (23) 0  
Others (43,261) (66,593) [1]  
Ending balance 59,815 49,461 59,972
Intangible assets under development | Carrying Amount Other than Government Grants      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 60,490 70,536  
Changes in intangible assets other than goodwill      
Acquisition 53,638 56,082  
Disposal 0 0  
Amortization 0 0  
Impairment loss (23) 0  
Others (47,087) (66,128) [1]  
Ending balance 67,018 60,490 70,536
Intangible assets under development | Acquisition cost      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 73,335 83,381  
Changes in intangible assets other than goodwill      
Ending balance 79,862 73,335 83,381
Intangible assets under development | Accumulated impairment [Member]      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (12,845) (12,845)  
Changes in intangible assets other than goodwill      
Ending balance (12,844) (12,845) (12,845)
Intangible assets under development | Government grants      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (11,029) (10,564)  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization 0 0  
Impairment loss 0 0  
Others 3,826 (465) [1]  
Ending balance (7,203) (11,029) (10,564)
Usage rights of donated assets and other      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 193,161 87,011  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization (18,448) (15,632)  
Impairment loss 0 0  
Others 9,762 121,782 [1]  
Ending balance 184,475 193,161 87,011
Usage rights of donated assets and other | Carrying Amount Other than Government Grants      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 193,161 87,011  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization (18,448) (15,632)  
Impairment loss 0 0  
Others 9,762 121,782 [1]  
Ending balance 184,475 193,161 87,011
Usage rights of donated assets and other | Acquisition cost      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 582,825 459,682  
Changes in intangible assets other than goodwill      
Ending balance 592,930 582,825 459,682
Usage rights of donated assets and other | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (389,664) (372,671)  
Changes in intangible assets other than goodwill      
Ending balance (408,455) (389,664) (372,671)
Usage rights of donated assets and other | Government grants      
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 0 0  
Impairment loss 0 0  
Others 0 0 [1]  
Ending balance 0 0 0
Leasehold rights      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 5,318 5,552  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization (831) (741)  
Impairment loss 0 0  
Others 1,853 507 [1]  
Ending balance 6,340 5,318 5,552
Leasehold rights | Carrying Amount Other than Government Grants      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 5,318 5,552  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization (831) (741)  
Impairment loss 0 0  
Others 1,853 507 [1]  
Ending balance 6,340 5,318 5,552
Leasehold rights | Acquisition cost      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 25,989 25,482  
Changes in intangible assets other than goodwill      
Ending balance 27,843 25,989 25,482
Leasehold rights | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (20,671) (19,930)  
Changes in intangible assets other than goodwill      
Ending balance (21,503) (20,671) (19,930)
Greenhouse gas emissions rights      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 41,656 7,050  
Changes in intangible assets other than goodwill      
Acquisition 37,109 118,743  
Disposal (9,271) (7,058)  
Amortization 0 0  
Impairment loss 0 0  
Others (8,121) (77,079) [1]  
Ending balance 61,373 41,656 7,050
Greenhouse gas emissions rights | Carrying Amount Other than Government Grants      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 41,656 7,050  
Changes in intangible assets other than goodwill      
Acquisition 37,109 118,743  
Disposal (9,271) (7,058)  
Amortization 0 0  
Impairment loss 0 0  
Others (8,121) (77,079) [1]  
Ending balance 61,373 41,656 7,050
Greenhouse gas emissions rights | Acquisition cost      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 41,656 7,050  
Changes in intangible assets other than goodwill      
Ending balance 61,373 41,656 7,050
Others      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 426,285 217,084  
Changes in intangible assets other than goodwill      
Acquisition 3,217 2,307  
Disposal (46) (164)  
Amortization (30,472) (14,411)  
Impairment loss (3,576) (22)  
Others 20,863 221,491 [1]  
Ending balance 416,271 426,285 217,084
Others | Carrying Amount Other than Government Grants      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 426,364 217,084  
Changes in intangible assets other than goodwill      
Acquisition 3,217 2,307  
Disposal (46) (164)  
Amortization (30,476) (14,413)  
Impairment loss (3,576) (22)  
Others 20,863 221,572 [1]  
Ending balance 416,346 426,364 217,084
Others | Acquisition cost      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 557,749 333,621  
Changes in intangible assets other than goodwill      
Ending balance 566,200 557,749 333,621
Others | Accumulated amortization      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (119,446) (104,486)  
Changes in intangible assets other than goodwill      
Ending balance (137,843) (119,446) (104,486)
Others | Accumulated impairment [Member]      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (11,939) (12,051)  
Changes in intangible assets other than goodwill      
Ending balance (12,011) (11,939) (12,051)
Others | Government grants      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (79) 0  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization 4 2  
Impairment loss 0 0  
Others 0 (81) [1]  
Ending balance (75) (79) 0
Goodwill      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 97,977 2,582  
Changes in intangible assets other than goodwill      
Acquisition 189 95,395  
Disposal 0 0  
Amortization 0 0  
Impairment loss 0 0  
Others 0 0 [1]  
Ending balance 98,166 97,977 2,582
Goodwill | Acquisition cost      
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 97,977 2,582  
Changes in intangible assets other than goodwill      
Ending balance ₩ 98,166 ₩ 97,977 ₩ 2,582
[1] '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.
[2] 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.