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Segment, Geographic and Other Information - Summary of Operating Segments (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of operating segments [line items]      
Total segment revenue ₩ 59,913,607 ₩ 57,925,837 ₩ 58,568,082
Intersegment revenue 0 0 0
Revenue from external customers 59,913,607 57,925,837 58,568,082
Depreciation and amortisation 11,938,272 11,548,019 11,128,740
Interest income 221,874 242,586 268,118
Interest expense 1,914,457 1,995,425 2,046,811
Employee benefit expense 511,942 492,288 725,120
Loss on abandonment of property, plant and equipment 207,934 255,346 364,233
Increase in provisions, net 2,466,452 1,832,765 2,301,215
Operating profit (loss) (5,736,635) 4,096,620 (1,707,527)
Finance income 1,402,614 1,510,249 1,009,706
Finance expense (3,245,777) (2,896,443) (2,782,156)
Profit (loss) related to associates and joint ventures 494,584 281,107 214,138
Profit (loss) before income tax (7,085,214) 2,991,533 (3,265,838)
Segment assets 211,108,870 203,142,111  
Investments in associates and joint ventures 7,471,384 6,170,533  
Acquisition of non-current assets 12,781,634 13,401,665  
Segment liabilities 145,797,021 132,475,265  
Operating segments      
Disclosure of operating segments [line items]      
Profit (loss) related to associates and joint ventures 494,584 281,107 214,139
Segment assets 252,045,653 241,913,304  
Investments in associates and joint ventures 7,471,384 6,170,533  
Acquisition of non-current assets 12,793,635 13,432,396  
Segment liabilities 148,745,359 133,818,362  
Operating segments | Transmission and distribution      
Disclosure of operating segments [line items]      
Total segment revenue 58,999,388 57,345,933 58,328,372
Intersegment revenue 1,672,776 1,224,602 1,336,725
Revenue from external customers 57,326,612 56,121,331 56,991,647
Depreciation and amortisation 3,990,464 3,836,355 3,814,428
Interest income 36,831 48,220 73,478
Interest expense 678,986 737,973 777,120
Employee benefit expense 193,412 190,302 298,144
Loss on abandonment of property, plant and equipment 202,262 236,727 350,865
Increase in provisions, net 1,194,643 731,194 987,828
Operating profit (loss) (7,244,319) 3,045,912 (2,568,529)
Profit (loss) related to associates and joint ventures 391,116 169,176 140,757
Segment assets 115,578,517 113,115,667  
Investments in associates and joint ventures 4,700,863 4,204,090  
Acquisition of non-current assets 6,754,298 6,535,380  
Segment liabilities 68,531,927 59,772,046  
Operating segments | Electric power generation (Nuclear)      
Disclosure of operating segments [line items]      
Total segment revenue 9,324,391 9,938,941 8,937,026
Intersegment revenue 9,207,516 9,817,147 8,908,803
Revenue from external customers 116,875 121,794 28,223
Depreciation and amortisation 3,611,594 3,564,120 3,227,695
Interest income 22,209 25,581 37,277
Interest expense 477,512 503,485 511,864
Employee benefit expense 86,730 86,672 132,283
Loss on abandonment of property, plant and equipment 0 0 0
Increase in provisions, net 680,358 691,052 672,134
Operating profit (loss) 762,164 1,168,833 782,511
Profit (loss) related to associates and joint ventures (18,146) (4,905) (5,497)
Segment assets 64,628,651 61,850,865  
Investments in associates and joint ventures 141,885 116,867  
Acquisition of non-current assets 1,959,479 2,419,939  
Segment liabilities 38,361,337 35,652,467  
Operating segments | Electric power generation (Non-nuclear)      
Disclosure of operating segments [line items]      
Total segment revenue 25,837,982 20,329,611 24,254,957
Intersegment revenue 24,518,167 19,552,376 23,472,153
Revenue from external customers 1,319,815 777,235 782,804
Depreciation and amortisation 4,178,520 4,034,024 3,955,333
Interest income 22,226 20,843 35,626
Interest expense 624,391 622,346 655,466
Employee benefit expense 121,020 112,775 163,626
Loss on abandonment of property, plant and equipment 5,672 17,679 13,364
Increase in provisions, net 285,152 346,195 766,407
Operating profit (loss) 364,572 (172,884) 551,287
Profit (loss) related to associates and joint ventures 109,765 115,096 77,641
Segment assets 57,304,296 54,531,155  
Investments in associates and joint ventures 2,575,019 1,807,409  
Acquisition of non-current assets 3,331,813 3,758,795  
Segment liabilities 35,803,289 33,292,680  
Operating segments | Plant maintenance & engineering service      
Disclosure of operating segments [line items]      
Total segment revenue 2,805,785 2,703,472 2,627,539
Intersegment revenue 2,370,900 2,283,333 2,254,841
Revenue from external customers 434,885 420,139 372,698
Depreciation and amortisation 121,493 119,056 125,546
Interest income 9,515 11,789 14,214
Interest expense 933 1,250 2,861
Employee benefit expense 94,269 101,255 124,745
Loss on abandonment of property, plant and equipment 0 0 0
Increase in provisions, net 213,500 230,264 124,242
Operating profit (loss) 245,360 197,553 312,341
Profit (loss) related to associates and joint ventures 11,849 1,740 1,237
Segment assets 3,672,366 3,492,571  
Investments in associates and joint ventures 53,617 42,167  
Acquisition of non-current assets 110,330 141,226  
Segment liabilities 1,086,926 1,061,949  
Operating segments | Others      
Disclosure of operating segments [line items]      
Total segment revenue 2,010,843 1,582,001 1,049,324
Intersegment revenue 1,295,423 1,096,663 656,614
Revenue from external customers 715,420 485,338 392,710
Depreciation and amortisation 158,952 122,092 127,364
Interest income 158,680 167,005 141,262
Interest expense 162,345 162,843 134,248
Employee benefit expense 52,698 50,889 18,409
Loss on abandonment of property, plant and equipment 0 940 4
Increase in provisions, net 2,981 3,711 2,408
Operating profit (loss) 200,363 148,393 (489,585)
Profit (loss) related to associates and joint ventures 0 0 0
Segment assets 10,861,823 8,923,046  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets 637,715 577,056  
Segment liabilities 4,961,880 4,039,220  
Material reconciling items      
Disclosure of operating segments [line items]      
Total segment revenue (39,064,782) (33,974,121) (36,629,136)
Intersegment revenue (39,064,782) (33,974,121) (36,629,136)
Revenue from external customers 0 0 0
Depreciation and amortisation (122,751) (127,628) (121,626)
Interest income (27,587) (30,852) (33,739)
Interest expense (29,710) (32,472) (34,748)
Employee benefit expense (36,187) (49,605) (12,087)
Loss on abandonment of property, plant and equipment 0 0 0
Increase in provisions, net 89,818 (169,651) (251,804)
Operating profit (loss) (64,775) (291,187) (295,552)
Profit (loss) related to associates and joint ventures 0 0 ₩ 0
Segment assets (40,936,783) (38,771,193)  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets (12,001) (30,731)  
Segment liabilities (2,948,338) (1,343,097)  
Elimination of intersegment amounts      
Disclosure of operating segments [line items]      
Segment assets (41,701,400) (39,762,888)  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets (12,001) (30,731)  
Segment liabilities (8,101,011) (6,749,728)  
Equity method adjustment      
Disclosure of operating segments [line items]      
Segment assets 1,866,554 1,372,001  
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 1,881 47,664  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets 0 0  
Segment liabilities 5,248,627 5,417,629  
Others      
Disclosure of operating segments [line items]      
Segment assets (1,103,818) (427,970)  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets 0 0  
Segment liabilities ₩ (95,954) ₩ (10,998)