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Operating segments (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [Line Items]      
Total segment revenue ₩ 60,033,062 ₩ 59,335,889 ₩ 59,763,087
Intersegment revenue 0 0 0
Revenue from external customers 60,033,062 59,335,889 59,763,087
Depreciation and amortisation 10,024,794 9,773,711 8,960,988
Interest income 223,767 206,143 241,778
Interest expense 1,868,458 1,789,552 1,752,868
Employee benefit expense 360,575 391,360 373,753
Loss on abandonment of property, plant and equipment 481,176 424,091 426,519
Increase in provisions, net 1,056,994 1,690,120 1,782,732
Operating profit (loss) (685,109) 5,319,869 12,296,360
Finance income 796,870 1,530,618 791,543
Finance expense (2,470,743) (3,127,952) (2,437,087)
Profit (loss) related to associates and joint ventures 358,163 (108,317) (137,348)
Profit (loss) before income tax (2,000,819) 3,614,218 10,513,468
Segment assets 185,249,061 181,788,915 177,837,042
Investments in associates and joint ventures 5,878,345 5,330,696 5,510,448
Acquisition of non-current assets 12,377,457 12,679,845 12,153,211
Segment liabilities 114,156,299 108,824,274 104,786,497
Operating segments      
Disclosure of operating segments [Line Items]      
Total segment revenue 97,262,180 94,974,836 95,611,310
Intersegment revenue 37,229,118 35,638,947 35,848,223
Revenue from external customers 60,033,062 59,335,889 59,763,087
Depreciation and amortisation 10,081,743 9,833,297 9,006,486
Interest income 268,043 230,685 264,764
Interest expense 1,912,094 1,818,399 1,778,479
Employee benefit expense 391,055 421,827 400,072
Loss on abandonment of property, plant and equipment 481,176 424,091 426,519
Increase in provisions, net 1,049,005 2,076,867 1,785,741
Operating profit (loss) (557,368) 5,152,814 12,543,173
Profit (loss) related to associates and joint ventures 358,163 (108,317) (137,348)
Segment assets 223,823,428 220,561,693 216,061,727
Investments in associates and joint ventures 5,878,345 5,330,696 5,510,448
Acquisition of non-current assets 12,440,174 12,656,229 12,345,112
Segment liabilities 115,812,546 110,538,279 107,405,716
Operating segments | Transmission and distribution      
Disclosure of operating segments [Line Items]      
Total segment revenue 59,676,952 59,486,766 59,862,284
Intersegment revenue 1,393,120 2,044,160 1,890,489
Revenue from external customers 58,283,832 57,442,606 57,971,795
Depreciation and amortisation 3,555,158 3,466,410 3,226,700
Interest income 77,925 49,987 80,882
Interest expense 708,329 737,971 844,200
Employee benefit expense 144,180 158,738 162,326
Loss on abandonment of property, plant and equipment 424,774 384,595 424,356
Increase in provisions, net 580,931 885,195 711,430
Operating profit (loss) (1,814,363) 1,902,634 5,274,308
Profit (loss) related to associates and joint ventures 287,268 (105,166) (128,402)
Segment assets 107,486,379 106,540,154 105,321,129
Investments in associates and joint ventures 3,671,897 3,366,309 4,121,462
Acquisition of non-current assets 6,323,504 6,606,512 6,345,004
Segment liabilities 53,404,610 50,757,798 49,854,420
Operating segments | Electric power generation (Nuclear)      
Disclosure of operating segments [Line Items]      
Total segment revenue 8,858,717 9,415,752 11,168,579
Intersegment revenue 8,833,787 9,359,468 11,129,385
Revenue from external customers 24,930 56,284 39,194
Depreciation and amortisation 3,088,019 3,267,510 3,130,820
Interest income 30,422 21,034 33,111
Interest expense 503,161 487,503 474,590
Employee benefit expense 76,467 80,809 70,582
Loss on abandonment of property, plant and equipment 38,886 0 0
Increase in provisions, net 520,167 801,800 576,223
Operating profit (loss) 357,401 1,347,794 3,770,165
Profit (loss) related to associates and joint ventures 9,946 3,637 (1,082)
Segment assets 55,792,704 55,011,096 52,782,915
Investments in associates and joint ventures 43,038 11,843 15,384
Acquisition of non-current assets 2,187,077 2,083,967 1,945,610
Segment liabilities 30,484,104 29,252,816 27,366,938
Operating segments | Electric power generation (Non-nuclear)      
Disclosure of operating segments [Line Items]      
Total segment revenue 25,204,085 22,795,816 21,394,223
Intersegment revenue 24,389,816 21,885,251 20,561,044
Revenue from external customers 814,269 910,565 833,179
Depreciation and amortisation 3,269,023 2,954,375 2,523,306
Interest income 29,313 18,860 24,171
Interest expense 577,441 486,176 359,607
Employee benefit expense 91,140 94,075 79,846
Loss on abandonment of property, plant and equipment 17,516 39,335 2,133
Increase in provisions, net (227,234) 171,457 276,619
Operating profit (loss) 482,418 1,523,497 3,211,684
Profit (loss) related to associates and joint ventures 58,993 (6,718) (8,342)
Segment assets 49,296,392 47,938,084 47,427,642
Investments in associates and joint ventures 2,114,203 1,904,224 1,320,203
Acquisition of non-current assets 3,435,222 3,250,524 3,508,313
Segment liabilities 27,558,156 26,337,295 26,205,049
Operating segments | Plant maintenance & engineering service      
Disclosure of operating segments [Line Items]      
Total segment revenue 2,526,126 2,621,440 2,618,388
Intersegment revenue 2,170,959 2,211,716 2,190,207
Revenue from external customers 355,167 409,724 428,181
Depreciation and amortisation 114,030 109,001 98,843
Interest income 12,505 10,801 10,672
Interest expense 4,126 2,967 2,156
Employee benefit expense 77,526 87,344 86,268
Loss on abandonment of property, plant and equipment 0 161 0
Increase in provisions, net 174,785 219,382 221,301
Operating profit (loss) 314,755 265,593 210,680
Profit (loss) related to associates and joint ventures 1,956 (70) 478
Segment assets 3,431,068 3,273,959 3,106,909
Investments in associates and joint ventures 49,207 48,320 53,399
Acquisition of non-current assets 111,393 145,779 180,715
Segment liabilities 1,200,390 1,176,627 1,218,047
Operating segments | Others      
Disclosure of operating segments [Line Items]      
Total segment revenue 996,300 655,062 567,836
Intersegment revenue 441,436 138,352 77,098
Revenue from external customers 554,864 516,710 490,738
Depreciation and amortisation 55,513 36,001 26,817
Interest income 117,878 130,003 115,928
Interest expense 119,037 103,782 97,926
Employee benefit expense 1,742 861 1,050
Loss on abandonment of property, plant and equipment 0 0 30
Increase in provisions, net 356 (967) 168
Operating profit (loss) 102,421 113,296 76,336
Profit (loss) related to associates and joint ventures 0 0 0
Segment assets 7,816,885 7,798,400 7,423,132
Investments in associates and joint ventures 0 0 0
Acquisition of non-current assets 382,978 569,447 365,470
Segment liabilities 3,165,286 3,013,743 2,761,262
Material reconciling items      
Disclosure of operating segments [Line Items]      
Total segment revenue (37,229,118) (35,638,947) (35,848,223)
Intersegment revenue (37,229,118) (35,638,947) (35,848,223)
Depreciation and amortisation (56,949) (59,586) (45,498)
Interest income (44,276) (24,542) (22,986)
Interest expense (43,636) (28,847) (25,611)
Employee benefit expense (30,480) (30,467) (26,319)
Increase in provisions, net 7,989 (386,747) (3,009)
Operating profit (loss) (127,741) 167,055 (246,813)
Segment assets (38,574,367) (38,772,778) (38,224,685)
Investments in associates and joint ventures 0 0 0
Acquisition of non-current assets (62,717) 23,616 (191,901)
Segment liabilities (1,656,247) (1,714,005) ₩ (2,619,219)
Elimination of intersegment amounts      
Disclosure of operating segments [Line Items]      
Segment assets (41,026,970) (39,517,829)  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets (62,717) 23,616  
Segment liabilities (5,055,737) (5,239,156)  
Equity method adjustment      
Disclosure of operating segments [Line Items]      
Segment assets 964,234 754,314  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets 0 0  
Segment liabilities 0 0  
Deferred taxes      
Disclosure of operating segments [Line Items]      
Segment assets 2,131 2,215  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets 0 0  
Segment liabilities (621) 5,339,450  
Others      
Disclosure of operating segments [Line Items]      
Segment assets 1,486,238 (11,478)  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets 0 0  
Segment liabilities ₩ 3,400,111 ₩ (1,814,299)