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Detailed information about intangible assets (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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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.

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