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Segment, Geographic and Other Information - Summary of Operating Segments (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of operating segments [line items]      
Total segment revenue ₩ 70,546,024 ₩ 60,012,375 ₩ 57,926,634
Intersegment revenue 0 0 0
Revenue from external customers 70,546,024 60,012,375 57,926,634
Depreciation and amortisation 12,461,412 11,942,492 11,548,019
Interest income 340,753 221,874 242,586
Interest expense 2,818,546 1,914,457 1,995,425
Employee benefit expense 485,700 511,942 492,288
Loss on abandonment of property, plant and equipment 160,909 207,934 255,346
Increase in provisions, net 2,146,979 2,466,452 1,832,765
Operating profit (loss) (32,240,531) (5,722,991) 4,097,834
Finance income 1,833,312 1,402,614 1,510,249
Finance expense (4,746,791) (3,245,777) (2,896,443)
Profit (loss) related to associates and joint ventures 1,310,391 494,584 281,107
Profit (loss) before income tax (33,843,619) (7,071,570) 2,992,747
Segment assets 234,804,994 211,123,727  
Investments in associates and joint ventures 8,992,048 7,471,384  
Acquisition of non-current assets 12,612,993 12,799,826  
Segment liabilities 192,804,738 145,797,021  
Operating segments      
Disclosure of operating segments [line items]      
Profit (loss) related to associates and joint ventures 1,310,391 494,584 281,107
Segment assets 286,568,529 252,060,510  
Investments in associates and joint ventures 8,992,048 7,471,384  
Acquisition of non-current assets 12,651,626 12,811,827  
Segment liabilities 199,305,065 148,745,359  
Operating segments | Transmission and distribution      
Disclosure of operating segments [line items]      
Total segment revenue 68,239,707 58,999,388 57,345,933
Intersegment revenue 1,922,354 1,672,776 1,224,602
Revenue from external customers 66,317,353 57,326,612 56,121,331
Depreciation and amortisation 4,130,004 3,990,464 3,836,355
Interest income 67,076 36,831 48,220
Interest expense 1,420,802 678,986 737,973
Employee benefit expense 180,114 193,412 190,302
Loss on abandonment of property, plant and equipment 157,784 202,262 236,727
Increase in provisions, net 611,534 1,194,643 731,194
Operating profit (loss) (33,623,874) (7,244,319) 3,045,912
Profit (loss) related to associates and joint ventures 980,146 391,116 169,176
Segment assets 131,023,727 115,578,517  
Investments in associates and joint ventures 5,678,141 4,700,863  
Acquisition of non-current assets 6,055,179 6,754,298  
Segment liabilities 108,963,058 68,531,927  
Operating segments | Electric power generation (Nuclear)      
Disclosure of operating segments [line items]      
Total segment revenue 10,386,091 9,324,391 9,938,941
Intersegment revenue 10,254,271 9,207,516 9,817,147
Revenue from external customers 131,820 116,875 121,794
Depreciation and amortisation 4,034,774 3,611,594 3,564,120
Interest income 45,789 22,209 25,581
Interest expense 557,218 477,512 503,485
Employee benefit expense 82,466 86,730 86,672
Loss on abandonment of property, plant and equipment 0 0 0
Increase in provisions, net 624,221 680,358 691,052
Operating profit (loss) 761,109 762,164 1,168,833
Profit (loss) related to associates and joint ventures (753) (18,146) (4,905)
Segment assets 69,129,625 64,628,651  
Investments in associates and joint ventures 143,304 141,885  
Acquisition of non-current assets 2,008,409 1,959,479  
Segment liabilities 42,843,974 38,361,337  
Operating segments | Electric power generation (Non-nuclear)      
Disclosure of operating segments [line items]      
Total segment revenue 41,944,339 25,928,596 20,329,611
Intersegment revenue 39,252,851 24,518,167 19,552,376
Revenue from external customers 2,691,488 1,410,429 777,235
Depreciation and amortisation 4,091,081 4,182,470 4,034,024
Interest income 53,242 22,226 20,843
Interest expense 694,559 624,391 622,346
Employee benefit expense 140,067 121,020 112,775
Loss on abandonment of property, plant and equipment 0 5,672 17,679
Increase in provisions, net 619,947 285,152 346,195
Operating profit (loss) 289,001 370,440 (172,884)
Profit (loss) related to associates and joint ventures 329,112 109,765 115,096
Segment assets 69,468,039 57,310,164  
Investments in associates and joint ventures 3,113,918 2,575,019  
Acquisition of non-current assets 3,547,815 3,341,960  
Segment liabilities 40,428,907 35,803,289  
Operating segments | Plant maintenance & engineering service      
Disclosure of operating segments [line items]      
Total segment revenue 2,975,062 2,805,785 2,703,472
Intersegment revenue 2,516,699 2,370,900 2,283,333
Revenue from external customers 458,363 434,885 420,139
Depreciation and amortisation 123,168 121,493 119,056
Interest income 14,003 9,515 11,789
Interest expense 1,405 933 1,250
Employee benefit expense 82,070 94,269 101,255
Loss on abandonment of property, plant and equipment 0 0 0
Increase in provisions, net 213,671 213,500 230,264
Operating profit (loss) 239,529 245,360 197,553
Profit (loss) related to associates and joint ventures 1,886 11,849 1,740
Segment assets 4,051,157 3,672,366  
Investments in associates and joint ventures 56,685 53,617  
Acquisition of non-current assets 200,338 110,330  
Segment liabilities 1,272,408 1,086,926  
Operating segments | Others      
Disclosure of operating segments [line items]      
Total segment revenue 2,750,231 2,018,997 1,582,798
Intersegment revenue 1,803,231 1,295,423 1,096,663
Revenue from external customers 947,000 723,574 486,135
Depreciation and amortisation 211,719 159,222 122,092
Interest income 195,966 158,680 167,005
Interest expense 195,860 162,345 162,843
Employee benefit expense 53,017 52,698 50,889
Loss on abandonment of property, plant and equipment 3,125 0 940
Increase in provisions, net 9,463 2,981 3,711
Operating profit (loss) 333,547 208,139 149,607
Profit (loss) related to associates and joint ventures 0 0 0
Segment assets 12,895,981 10,870,812  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets 839,885 645,760  
Segment liabilities 5,796,718 4,961,880  
Material reconciling items      
Disclosure of operating segments [line items]      
Total segment revenue (55,749,406) (39,064,782) (33,974,121)
Intersegment revenue (55,749,406) (39,064,782) (33,974,121)
Revenue from external customers 0 0 0
Depreciation and amortisation (129,334) (122,751) (127,628)
Interest income (35,323) (27,587) (30,852)
Interest expense (51,298) (29,710) (32,472)
Employee benefit expense (52,034) (36,187) (49,605)
Loss on abandonment of property, plant and equipment 0 0 0
Increase in provisions, net 68,143 89,818 (169,651)
Operating profit (loss) (239,843) (64,775) (291,187)
Profit (loss) related to associates and joint ventures 0 0 ₩ 0
Segment assets (51,763,535) (40,936,783)  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets (38,633) (12,001)  
Segment liabilities (6,500,327) (2,948,338)  
Elimination of intersegment amounts      
Disclosure of operating segments [line items]      
Segment assets (43,801,723) (41,701,400)  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets (38,633) (12,001)  
Segment liabilities (9,304,648) (8,101,011)  
Equity method adjustment      
Disclosure of operating segments [line items]      
Segment assets 2,859,623 1,866,554  
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 (452) 1,881  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets 0 0  
Segment liabilities 2,801,832 5,248,627  
Others      
Disclosure of operating segments [line items]      
Segment assets (10,820,983) (1,103,818)  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets 0 0  
Segment liabilities ₩ 2,489 ₩ (95,954)