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Detailed information about intangible assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value ₩ 1,225,942 ₩ 1,187,121  
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 1,187,121    
Changes in intangible assets other than goodwill      
Impairment loss 8,112 [1] 20 ₩ 3,945
Ending balance 1,225,942 1,187,121  
Intangible assets other than goodwill      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 1,225,942 1,187,121 980,821
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 1,187,121 980,821  
Changes in intangible assets other than goodwill      
Acquisition 110,587 143,887  
Disposal (9) (661)  
Amortization (118,938) (113,672)  
Impairment loss (8,140) [1] 34  
Others 55,321 176,712  
Ending balance 1,225,942 1,187,121 980,821
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 1,201,860 997,679
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 1,201,860 997,679  
Changes in intangible assets other than goodwill      
Acquisition 110,587 143,904  
Disposal (9) (661)  
Amortization (120,794) (116,748)  
Impairment loss (8,939) [1] 34  
Others 56,331 177,652  
Ending balance 1,239,036 1,201,860 997,679
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 2,581,539
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 2,897,446 2,581,539  
Changes in intangible assets other than goodwill      
Ending balance 3,069,716 2,897,446 2,581,539
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) (1,567,795)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (1,679,576) (1,567,795)  
Changes in intangible assets other than goodwill      
Ending balance (1,805,784) (1,679,576) (1,567,795)
Intangible assets other than goodwill | Accumulated impairment [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (24,896) (16,010) (16,065)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (16,010) (16,065)  
Changes in intangible assets other than goodwill      
Ending balance (24,896) (16,010) (16,065)
Intangible assets other than goodwill | Government grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (13,094) (14,739) (16,858)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (14,739) (16,858)  
Changes in intangible assets other than goodwill      
Acquisition 0 (17)  
Disposal 0 0  
Amortization 1,856 3,076  
Impairment loss 799 [1] 0  
Others (1,010) (940)  
Ending balance (13,094) (14,739) (16,858)
Software      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 157,261 125,405 92,626
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 125,405 92,626  
Changes in intangible assets other than goodwill      
Acquisition 10,861 12,683  
Disposal (1) (5)  
Amortization (53,501) (44,554)  
Impairment loss 0 [1] 0  
Others 74,497 64,655  
Ending balance 157,261 125,405 92,626
Software | Carrying Amount Other than Government Grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 157,681 125,891 93,221
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 125,891 93,221  
Changes in intangible assets other than goodwill      
Acquisition 10,861 12,700  
Disposal (1) (5)  
Amortization (53,755) (44,809)  
Impairment loss 0 [1] 0  
Others 74,685 64,784  
Ending balance 157,681 125,891 93,221
Software | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 619,662 534,191 458,382
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 534,191 458,382  
Changes in intangible assets other than goodwill      
Ending balance 619,662 534,191 458,382
Software | Accumulated amortization      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (461,981) (408,300) (365,161)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (408,300) (365,161)  
Changes in intangible assets other than goodwill      
Ending balance (461,981) (408,300) (365,161)
Software | Government grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (420) (486) (595)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (486) (595)  
Changes in intangible assets other than goodwill      
Acquisition 0 (17)  
Disposal 0 0  
Amortization 254 255  
Impairment loss 0 [1] 0  
Others (188) (129)  
Ending balance (420) (486) (595)
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 20,081
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 23,981 20,081  
Changes in intangible assets other than goodwill      
Acquisition 28 30  
Disposal 0 (7)  
Amortization (8,665) (3,350)  
Impairment loss (13) [1] 0  
Others 51,781 7,227  
Ending balance 67,112 23,981 20,081
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 20,081
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 23,981 20,081  
Changes in intangible assets other than goodwill      
Acquisition 28 30  
Disposal 0 (7)  
Amortization (8,665) (3,350)  
Impairment loss (13) [1] 0  
Others 51,781 7,227  
Ending balance 67,112 23,981 20,081
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 35,756
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 43,857 35,756  
Changes in intangible assets other than goodwill      
Ending balance 97,033 43,857 35,756
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) (15,675)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (19,876) (15,675)  
Changes in intangible assets other than goodwill      
Ending balance (29,921) (19,876) (15,675)
Mining rights      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 534,524 539,633 538,860
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 539,633 538,860  
Changes in intangible assets other than goodwill      
Acquisition 29,687 26,751  
Disposal 0 (272)  
Amortization (3,186) (4,640)  
Impairment loss 0 [1] 0  
Others (31,610) (21,066)  
Ending balance 534,524 539,633 538,860
Mining rights | Carrying Amount Other than Government Grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 534,524 539,633 538,860
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 539,633 538,860  
Changes in intangible assets other than goodwill      
Acquisition 29,687 26,751  
Disposal 0 (272)  
Amortization (3,186) (4,640)  
Impairment loss 0 [1] 0  
Others (31,610) (21,066)  
Ending balance 534,524 539,633 538,860
Mining rights | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 561,945 553,876 549,371
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 553,876 549,371  
Changes in intangible assets other than goodwill      
Ending balance 561,945 553,876 549,371
Mining rights | Accumulated amortization      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (27,421) (14,243) (10,511)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (14,243) (10,511)  
Changes in intangible assets other than goodwill      
Ending balance (27,421) (14,243) (10,511)
Development expenditures      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 90,376 80,816 57,253
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 80,816 57,253  
Changes in intangible assets other than goodwill      
Acquisition 823 494  
Disposal 0 0  
Amortization (25,509) (23,113)  
Impairment loss 0 [1] 0  
Others 34,246 46,182  
Ending balance 90,376 80,816 57,253
Development expenditures | Carrying Amount Other than Government Grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 92,486 84,518 62,405
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 84,518 62,405  
Changes in intangible assets other than goodwill      
Acquisition 823 494  
Disposal 0 0  
Amortization (27,100) (25,924)  
Impairment loss 0 [1] 0  
Others 34,245 47,543  
Ending balance 92,486 84,518 62,405
Development expenditures | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 878,462 836,996 785,966
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 836,996 785,966  
Changes in intangible assets other than goodwill      
Ending balance 878,462 836,996 785,966
Development expenditures | Accumulated amortization      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (785,976) (752,478) (723,561)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (752,478) (723,561)  
Changes in intangible assets other than goodwill      
Ending balance (785,976) (752,478) (723,561)
Development expenditures | Government grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (2,110) (3,702) (5,152)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (3,702) (5,152)  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization 1,591 2,811  
Impairment loss 0 [1] 0  
Others 1 (1,361)  
Ending balance (2,110) (3,702) (5,152)
Intangible assets under development      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 59,972 129,370 104,443
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 129,370 104,443  
Changes in intangible assets other than goodwill      
Acquisition 67,383 56,527  
Disposal 0 0  
Amortization 0 0  
Impairment loss (8,113) [1] (20)  
Others (128,668) (31,580)  
Ending balance 59,972 129,370 104,443
Intangible assets under development | Carrying Amount Other than Government Grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 70,536 139,910 115,533
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 139,910 115,533  
Changes in intangible assets other than goodwill      
Acquisition 67,383 56,527  
Disposal 0 0  
Amortization 0 0  
Impairment loss (8,912) [1] (20)  
Others (127,845) (32,130)  
Ending balance 70,536 139,910 115,533
Intangible assets under development | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 83,381 143,851 119,474
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 143,851 119,474  
Changes in intangible assets other than goodwill      
Ending balance 83,381 143,851 119,474
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 (3,941) (3,941)  
Changes in intangible assets other than goodwill      
Ending balance (12,845) (3,941) (3,941)
Intangible assets under development | Government grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (10,564) (10,540) (11,090)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (10,540) (11,090)  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization 0 0  
Impairment loss 799 [1] 0  
Others (823) 550  
Ending balance (10,564) (10,540) (11,090)
Usage rights of donated assets and other      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 87,011 101,647 84,081
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 101,647 84,081  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization (13,296) (14,452)  
Impairment loss 0 [1] 0  
Others (1,340) 32,018  
Ending balance 87,011 101,647 84,081
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 84,102
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 101,658 84,102  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization (13,307) (14,462)  
Impairment loss 0 [1] 0  
Others (1,340) 32,018  
Ending balance 87,011 101,658 84,102
Usage rights of donated assets and other | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 459,682 459,682 426,346
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 459,682 426,346  
Changes in intangible assets other than goodwill      
Ending balance 459,682 459,682 426,346
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) (342,244)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (358,024) (342,244)  
Changes in intangible assets other than goodwill      
Ending balance (372,671) (358,024) (342,244)
Usage rights of donated assets and other | Government grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 0 (11) (21)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (11) (21)  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization 11 10  
Impairment loss 0 [1] 0  
Others 0 0  
Ending balance 0 (11) (21)
Leasehold rights      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 5,552 5,044 4,632
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 5,044 4,632  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization (667) (545)  
Impairment loss 0 [1] 0  
Others 1,175 957  
Ending balance 5,552 5,044 4,632
Leasehold rights | Carrying Amount Other than Government Grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 5,552 5,044 4,632
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 5,044 4,632  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization (667) (545)  
Impairment loss 0 [1] 0  
Others 1,175 957  
Ending balance 5,552 5,044 4,632
Leasehold rights | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 25,482 24,306 23,350
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 24,306 23,350  
Changes in intangible assets other than goodwill      
Ending balance 25,482 24,306 23,350
Leasehold rights | Accumulated amortization      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (19,930) (19,262) (18,718)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (19,262) (18,718)  
Changes in intangible assets other than goodwill      
Ending balance (19,930) (19,262) (18,718)
Greenhouse gas emissions rights      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 7,050 0 6,283
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 0 6,283  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization 0 0  
Impairment loss 0 [1] 0  
Others 7,050 (6,283)  
Ending balance 7,050 0 6,283
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 6,283
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 0 6,283  
Changes in intangible assets other than goodwill      
Acquisition 0 0  
Disposal 0 0  
Amortization 0 0  
Impairment loss 0 [1] 0  
Others 7,050 (6,283)  
Ending balance 7,050 0 6,283
Greenhouse gas emissions rights | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 7,050 0 6,283
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 0 6,283  
Changes in intangible assets other than goodwill      
Ending balance 7,050 0 6,283
Others      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 217,084 181,225 72,562
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 181,225 72,562  
Changes in intangible assets other than goodwill      
Acquisition 1,805 47,402  
Disposal (8) (377)  
Amortization (14,114) (23,018)  
Impairment loss (14) [1] 54  
Others 48,190 84,602  
Ending balance 217,084 181,225 72,562
Others | Carrying Amount Other than Government Grants      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 217,084 181,225 72,562
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 181,225 72,562  
Changes in intangible assets other than goodwill      
Acquisition 1,805 47,402  
Disposal (8) (377)  
Amortization (14,114) (23,018)  
Impairment loss (14) [1] 54  
Others 48,190 84,602  
Ending balance 217,084 181,225 72,562
Others | Acquisition cost      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value 333,621 297,289 173,213
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance 297,289 173,213  
Changes in intangible assets other than goodwill      
Ending balance 333,621 297,289 173,213
Others | Accumulated amortization      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (104,486) (103,995) (88,527)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (103,995) (88,527)  
Changes in intangible assets other than goodwill      
Ending balance (104,486) (103,995) (88,527)
Others | Accumulated impairment [Member]      
Disclosure of detailed information about intangible assets [Line Items]      
Net carrying value (12,051) (12,069) (12,124)
Reconciliation of changes in intangible assets other than goodwill      
Beginning balance (12,069) (12,124)  
Changes in intangible assets other than goodwill      
Ending balance (12,051) (12,069) (12,124)
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 0 0  
Impairment loss 0 [1] 0  
Others 0 0  
Ending balance 0 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      
Ending balance 2,582 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 ₩ 2,582 ₩ 2,582 ₩ 2,582
[1] KRW8,104 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 included.