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Operating segments (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Disclosure of operating segments [Line Items]        
Total segment revenue ₩ 58,568,082 ₩ 60,033,062 ₩ 59,335,889  
Intersegment revenue 0 0 0  
Revenue from external customers 58,568,082 60,033,062 59,335,889  
Depreciation and amortisation 11,128,740 10,024,794 9,773,711  
Interest income 268,118 223,767 206,143  
Interest expense 2,046,811 1,868,458 1,789,552  
Employee benefit expense 725,120 360,575 391,360  
Loss on abandonment of property, plant and equipment 364,233 481,176 424,091  
Increase in provisions, net 2,301,215 1,056,994 1,690,120  
Operating profit (loss) (1,707,527) (685,109) 5,319,869  
Finance income 1,009,706 796,870 1,530,618  
Finance expense (2,782,156) (2,470,743) (3,127,952)  
Profit (loss) related to associates and joint ventures 214,139 358,163 (108,317)  
Profit (loss) before income tax (3,265,838) (2,000,819) 3,614,218  
Segment assets 197,597,792 185,249,061 181,788,915 ₩ 190,192,645
Investments in associates and joint ventures 5,914,831 5,878,345 5,330,696  
Acquisition of non-current assets 14,229,785 12,377,457 12,679,845  
Segment liabilities 128,708,143 114,156,299 108,824,274 ₩ 119,099,883
Operating segments        
Disclosure of operating segments [Line Items]        
Total segment revenue 95,197,218 97,262,180 94,974,836  
Intersegment revenue 36,629,136 37,229,118 35,638,947  
Revenue from external customers 58,568,082 60,033,062 59,335,889  
Depreciation and amortisation 11,250,366 10,081,743 9,833,297  
Interest income 301,857 268,043 230,685  
Interest expense 2,081,559 1,912,094 1,818,399  
Employee benefit expense 737,207 391,055 421,827  
Loss on abandonment of property, plant and equipment 364,233 481,176 424,091  
Increase in provisions, net 2,553,019 1,049,005 2,076,867  
Operating profit (loss) (1,411,975) (557,368) 5,152,814  
Profit (loss) related to associates and joint ventures 214,138 358,163 (108,317)  
Segment assets 235,492,772 223,823,428 220,561,693  
Investments in associates and joint ventures 5,914,831 5,878,345 5,330,696  
Acquisition of non-current assets 14,311,340 12,440,174 12,656,229  
Segment liabilities 130,033,377 115,812,546 110,538,279  
Operating segments | Transmission and distribution        
Disclosure of operating segments [Line Items]        
Total segment revenue 58,328,372 59,676,952 59,486,766  
Intersegment revenue 1,336,725 1,393,120 2,044,160  
Revenue from external customers 56,991,647 58,283,832 57,442,606  
Depreciation and amortisation 3,814,428 3,555,158 3,466,410  
Interest income 73,478 77,925 49,987  
Interest expense 777,120 708,329 737,971  
Employee benefit expense 298,144 144,180 158,738  
Loss on abandonment of property, plant and equipment 350,865 424,774 384,595  
Increase in provisions, net 987,828 580,931 885,195  
Operating profit (loss) (2,568,529) (1,814,363) 1,902,634  
Profit (loss) related to associates and joint ventures 140,757 287,268 (105,166)  
Segment assets 109,809,254 107,486,379 106,540,154  
Investments in associates and joint ventures 3,716,931 3,671,897 3,366,309  
Acquisition of non-current assets 6,340,593 6,323,504 6,606,512  
Segment liabilities 58,350,681 53,404,610 50,757,798  
Operating segments | Electric power generation (Nuclear)        
Disclosure of operating segments [Line Items]        
Total segment revenue 8,937,026 8,858,717 9,415,752  
Intersegment revenue 8,908,803 8,833,787 9,359,468  
Revenue from external customers 28,223 24,930 56,284  
Depreciation and amortisation 3,227,695 3,088,019 3,267,510  
Interest income 37,277 30,422 21,034  
Interest expense 511,864 503,161 487,503  
Employee benefit expense 132,283 76,467 80,809  
Loss on abandonment of property, plant and equipment 0 38,886 0  
Increase in provisions, net 672,134 520,167 801,800  
Operating profit (loss) 782,511 357,401 1,347,794  
Profit (loss) related to associates and joint ventures (5,497) 9,946 3,637  
Segment assets 59,562,190 55,792,704 55,011,096  
Investments in associates and joint ventures 59,081 43,038 11,843  
Acquisition of non-current assets 2,574,358 2,187,077 2,083,967  
Segment liabilities 33,909,152 30,484,104 29,252,816  
Operating segments | Electric power generation (Non-nuclear)        
Disclosure of operating segments [Line Items]        
Total segment revenue 24,254,957 25,204,085 22,795,816  
Intersegment revenue 23,472,153 24,389,816 21,885,251  
Revenue from external customers 782,804 814,269 910,565  
Depreciation and amortisation 3,955,333 3,269,023 2,954,375  
Interest income 35,626 29,313 18,860  
Interest expense 655,466 577,441 486,176  
Employee benefit expense 163,626 91,140 94,075  
Loss on abandonment of property, plant and equipment 13,364 17,516 39,335  
Increase in provisions, net 766,407 (227,234) 171,457  
Operating profit (loss) 551,287 482,418 1,523,497  
Profit (loss) related to associates and joint ventures 77,641 58,993 (6,718)  
Segment assets 54,758,933 49,296,392 47,938,084  
Investments in associates and joint ventures 2,088,581 2,114,203 1,904,224  
Acquisition of non-current assets 4,955,784 3,435,222 3,250,524  
Segment liabilities 33,117,193 27,558,156 26,337,295  
Operating segments | Plant maintenance & engineering service        
Disclosure of operating segments [Line Items]        
Total segment revenue 2,627,539 2,526,126 2,621,440  
Intersegment revenue 2,254,841 2,170,959 2,211,716  
Revenue from external customers 372,698 355,167 409,724  
Depreciation and amortisation 125,546 114,030 109,001  
Interest income 14,214 12,505 10,801  
Interest expense 2,861 4,126 2,967  
Employee benefit expense 124,745 77,526 87,344  
Loss on abandonment of property, plant and equipment 0 0 161  
Increase in provisions, net 124,242 174,785 219,382  
Operating profit (loss) 312,341 314,755 265,593  
Profit (loss) related to associates and joint ventures 1,237 1,956 (70)  
Segment assets 3,528,879 3,431,068 3,273,959  
Investments in associates and joint ventures 50,238 49,207 48,320  
Acquisition of non-current assets 95,810 111,393 145,779  
Segment liabilities 1,124,855 1,200,390 1,176,627  
Operating segments | Others        
Disclosure of operating segments [Line Items]        
Total segment revenue 1,049,324 996,300 655,062  
Intersegment revenue 656,614 441,436 138,352  
Revenue from external customers 392,710 554,864 516,710  
Depreciation and amortisation 127,364 55,513 36,001  
Interest income 141,262 117,878 130,003  
Interest expense 134,248 119,037 103,782  
Employee benefit expense 18,409 1,742 861  
Loss on abandonment of property, plant and equipment 4 0 0  
Increase in provisions, net 2,408 356 (967)  
Operating profit (loss) (489,585) 102,421 113,296  
Profit (loss) related to associates and joint ventures 0 0 0  
Segment assets 7,833,516 7,816,885 7,798,400  
Investments in associates and joint ventures 0 0 0  
Acquisition of non-current assets 344,795 382,978 569,447  
Segment liabilities 3,531,496 3,165,286 3,013,743  
Material reconciling items        
Disclosure of operating segments [Line Items]        
Total segment revenue (36,629,136) (37,229,118) (35,638,947)  
Intersegment revenue (36,629,136) (37,229,118) (35,638,947)  
Revenue from external customers 0 0 0  
Depreciation and amortisation (121,626) (56,949) (59,586)  
Interest income (33,739) (44,276) (24,542)  
Interest expense (34,748) (43,636) (28,847)  
Employee benefit expense (12,087) (30,480) (30,467)  
Loss on abandonment of property, plant and equipment 0 0 0  
Increase in provisions, net (251,804) 7,989 (386,747)  
Operating profit (loss) (295,552) (127,741) 167,055  
Profit (loss) related to associates and joint ventures 0 0 0  
Segment assets (37,894,980) (38,574,367) (38,772,778)  
Investments in associates and joint ventures 0 0 0  
Acquisition of non-current assets (81,555) (62,717) 23,616  
Segment liabilities (1,325,234) (1,656,247) ₩ (1,714,005)  
Elimination of intersegment amounts        
Disclosure of operating segments [Line Items]        
Segment assets (39,207,636) (41,026,970)    
Investments in associates and joint ventures 0 0    
Acquisition of non-current assets (81,555) (62,717)    
Segment liabilities (6,654,717) (5,055,737)    
Equity method adjustment        
Disclosure of operating segments [Line Items]        
Segment assets 1,791,844 964,234    
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 2,048 2,131    
Investments in associates and joint ventures 0 0    
Acquisition of non-current assets 0 0    
Segment liabilities 5,329,158 (621)    
Others        
Disclosure of operating segments [Line Items]        
Segment assets (481,236) 1,486,238    
Investments in associates and joint ventures 0 0    
Acquisition of non-current assets 0 0    
Segment liabilities ₩ 325 ₩ 3,400,111