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Operating segments (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of operating segments [Line Items]      
Total segment revenue ₩ 59,335,889 ₩ 59,763,087 ₩ 58,581,727
Revenue from external customers 59,335,889 59,763,087 58,581,727
Depreciation and amortisation 9,773,711 8,960,988 8,341,384
Interest income 206,143 241,778 241,585
Interest expense 1,789,552 1,752,868 2,015,684
Employee benefit expense 391,360 373,753 314,692
Loss on abandonment of property, plant and equipment 424,091 426,519 365,056
Increase in provisions, net 1,690,120 1,782,732 1,602,724
Operating profit (loss) 5,319,869 12,296,360 20,280,876
Finance income 1,530,618 791,543 1,182,988
Finance expense (3,127,952) (2,437,087) (3,015,457)
Profit (loss) related to associates and joint ventures (108,317) (137,348) 207,379
Profit before income tax 3,614,218 10,513,468 18,655,786
Segment assets 181,788,915 177,837,042  
Investments in associates and joint ventures 5,330,696 5,510,448  
Acquisition of non-current assets 12,679,845 12,153,211  
Segment liabilities 108,824,274 104,786,497  
Operating segments [Member]      
Disclosure of operating segments [Line Items]      
Total segment revenue 94,974,836 95,611,310 93,482,228
Intersegment revenue 35,638,947 35,848,223 34,900,501
Revenue from external customers 59,335,889 59,763,087 58,581,727
Depreciation and amortisation 9,833,297 9,006,486 8,380,371
Interest income 230,685 264,764 299,989
Interest expense 1,818,399 1,778,479 2,072,957
Employee benefit expense 421,827 400,072 338,725
Loss on abandonment of property, plant and equipment 424,091 426,519 365,056
Increase in provisions, net 2,076,867 1,785,741 1,596,934
Operating profit (loss) 5,152,814 12,543,173 20,242,883
Profit (loss) related to associates and joint ventures (108,317) (137,348) 207,379
Segment assets 220,561,693 216,061,727  
Investments in associates and joint ventures 5,330,696 5,510,448  
Acquisition of non-current assets 12,656,229 12,345,112  
Segment liabilities 110,538,279 107,405,716  
Operating segments [Member] | Transmission and distribution [Member]      
Disclosure of operating segments [Line Items]      
Total segment revenue 59,486,766 59,862,284 58,164,394
Intersegment revenue 2,044,160 1,890,489 1,230,975
Revenue from external customers 57,442,606 57,971,795 56,933,419
Depreciation and amortisation 3,466,410 3,226,700 2,859,037
Interest income 49,987 80,882 132,809
Interest expense 737,971 844,200 1,092,594
Employee benefit expense 158,738 162,326 135,261
Loss on abandonment of property, plant and equipment 384,595 424,356 359,521
Increase in provisions, net 885,195 711,430 872,096
Operating profit (loss) 1,902,634 5,274,308 13,319,310
Profit (loss) related to associates and joint ventures (105,166) (128,402) 220,406
Segment assets 106,540,154 105,321,129  
Investments in associates and joint ventures 3,366,309 4,121,462  
Acquisition of non-current assets 6,606,512 6,345,004  
Segment liabilities 50,757,798 49,854,420  
Operating segments [Member] | Electric power generation (Nuclear) [Member]      
Disclosure of operating segments [Line Items]      
Total segment revenue 9,415,752 11,168,579 10,642,352
Intersegment revenue 9,359,468 11,129,385 10,596,189
Revenue from external customers 56,284 39,194 46,163
Depreciation and amortisation 3,267,510 3,130,820 3,070,828
Interest income 21,034 33,111 24,612
Interest expense 487,503 474,590 532,490
Employee benefit expense 80,809 70,582 54,572
Increase in provisions, net 801,800 576,223 401,839
Operating profit (loss) 1,347,794 3,770,165 3,806,617
Profit (loss) related to associates and joint ventures 3,637 (1,082) (595)
Segment assets 55,011,096 52,782,915  
Investments in associates and joint ventures 11,843 15,384  
Acquisition of non-current assets 2,083,967 1,945,610  
Segment liabilities 29,252,816 27,366,938  
Operating segments [Member] | Electric power generation (Non-nuclear) [Member]      
Disclosure of operating segments [Line Items]      
Total segment revenue 22,795,816 21,394,223 21,469,345
Intersegment revenue 21,885,251 20,561,044 20,906,081
Revenue from external customers 910,565 833,179 563,264
Depreciation and amortisation 2,954,375 2,523,306 2,337,353
Interest income 18,860 24,171 22,171
Interest expense 486,176 359,607 319,647
Employee benefit expense 94,075 79,846 74,007
Loss on abandonment of property, plant and equipment 39,335 2,133 5,305
Increase in provisions, net 171,457 276,619 148,053
Operating profit (loss) 1,523,497 3,211,684 2,704,260
Profit (loss) related to associates and joint ventures (6,718) (8,342) (10,686)
Segment assets 47,938,084 47,427,642  
Investments in associates and joint ventures 1,904,224 1,320,203  
Acquisition of non-current assets 3,250,524 3,508,313  
Segment liabilities 26,337,295 26,205,049  
Operating segments [Member] | Plant maintenance & engineering service [Member]      
Disclosure of operating segments [Line Items]      
Total segment revenue 2,621,440 2,618,388 2,533,887
Intersegment revenue 2,211,716 2,190,207 2,016,699
Revenue from external customers 409,724 428,181 517,188
Depreciation and amortisation 109,001 98,843 85,662
Interest income 10,801 10,672 12,293
Interest expense 2,967 2,156 542
Employee benefit expense 87,344 86,268 74,542
Loss on abandonment of property, plant and equipment 161    
Increase in provisions, net 219,382 221,301 174,912
Operating profit (loss) 265,593 210,680 332,531
Profit (loss) related to associates and joint ventures (70) 478 (1,746)
Segment assets 3,273,959 3,106,909  
Investments in associates and joint ventures 48,320 53,399  
Acquisition of non-current assets 145,779 180,715  
Segment liabilities 1,176,627 1,218,047  
Operating segments [Member] | Others [Member]      
Disclosure of operating segments [Line Items]      
Total segment revenue 655,062 567,836 672,250
Intersegment revenue 138,352 77,098 150,557
Revenue from external customers 516,710 490,738 521,693
Depreciation and amortisation 36,001 26,817 27,491
Interest income 130,003 115,928 108,104
Interest expense 103,782 97,926 127,684
Employee benefit expense 861 1,050 343
Loss on abandonment of property, plant and equipment   30 230
Increase in provisions, net (967) 168 34
Operating profit (loss) 113,296 76,336 80,165
Segment assets 7,798,400 7,423,132  
Acquisition of non-current assets 569,447 365,470  
Segment liabilities 3,013,743 2,761,262  
Material reconciling items [Member]      
Disclosure of operating segments [Line Items]      
Total segment revenue (35,638,947) (35,848,223) (34,900,501)
Intersegment revenue (35,638,947) (35,848,223) (34,900,501)
Depreciation and amortisation (59,586) (45,498) (38,987)
Interest income (24,542) (22,986) (58,404)
Interest expense (28,847) (25,611) (57,273)
Employee benefit expense (30,467) (26,319) (24,033)
Increase in provisions, net (386,747) (3,009) 5,790
Operating profit (loss) 167,055 (246,813) ₩ 37,993
Segment assets (38,772,778) (38,224,685)  
Acquisition of non-current assets 23,616 (191,901)  
Segment liabilities (1,714,005) (2,619,219)  
Elimination of intersegment amounts [Member]      
Disclosure of operating segments [Line Items]      
Segment assets (39,517,829) (39,114,371)  
Acquisition of non-current assets 23,616 (191,901)  
Segment liabilities (5,239,156) (5,811,800)  
Equity method adjustment [Member]      
Disclosure of operating segments [Line Items]      
Segment assets 754,314 906,239  
Deferred taxes [Member]      
Disclosure of operating segments [Line Items]      
Segment assets 2,215 (5,830)  
Segment liabilities 5,339,450 4,301,404  
Others [Member]      
Disclosure of operating segments [Line Items]      
Segment assets (11,478) (10,723)  
Segment liabilities ₩ (1,814,299) ₩ (1,108,823)