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Segment, Geographic and Other Information - Summary of Operating Segments (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of operating segments [line items]      
Total segment revenue ₩ 87,476,410 ₩ 70,546,024 ₩ 60,012,375
Intersegment revenue 0 0 0
Revenue from external customers 87,476,410 70,546,024 60,012,375
Depreciation and amortisation 13,032,263 12,461,412 11,942,492
Interest income 429,620 340,753 221,874
Interest expense 4,451,659 2,818,546 1,914,457
Employee benefit expense 358,730 485,700 511,942
Loss on abandonment of property, plant and equipment 196,697 160,909 207,934
Increase in provisions, net 1,611,082 2,146,979 2,466,452
Operating profit (loss) (4,245,016) (32,240,531) (5,722,991)
Finance income 1,425,031 1,833,312 1,402,614
Finance expense (5,347,018) (4,746,791) (3,245,777)
Profit (loss) related to associates and joint ventures 613,026 1,310,391 494,584
Profit (loss) before income tax (7,553,977) (33,843,619) (7,071,570)
Segment assets 239,714,965 234,804,994  
Investments in associates and joint ventures 9,662,588 8,992,048 7,471,384
Acquisition of non-current assets 14,746,889 12,612,993  
Segment liabilities 202,450,215 192,804,738  
Deferred taxes      
Disclosure of operating segments [line items]      
Segment assets 1,636 (452)  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets 0 0  
Segment liabilities 1,629,280 2,801,832  
Equity method adjustment      
Disclosure of operating segments [line items]      
Segment assets 2,997,016 2,859,623  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets 0 0  
Segment liabilities 0 0  
Others      
Disclosure of operating segments [line items]      
Segment assets (10,501,492) (10,820,983)  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets 0 0  
Segment liabilities (3,450) 2,489  
Elimination of intersegment amounts      
Disclosure of operating segments [line items]      
Segment assets (46,071,077) (43,801,723)  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets (390,686) (38,633)  
Segment liabilities (11,463,805) (9,304,648)  
Operating segments      
Disclosure of operating segments [line items]      
Profit (loss) related to associates and joint ventures 613,026 1,310,391 494,584
Segment assets 293,288,882 286,568,529  
Investments in associates and joint ventures 9,662,588 8,992,048  
Acquisition of non-current assets 15,137,575 12,651,626  
Segment liabilities 212,288,190 199,305,065  
Operating segments | Transmission and distribution      
Disclosure of operating segments [line items]      
Total segment revenue 85,082,542 68,239,707 58,999,388
Intersegment revenue 1,728,602 1,922,354 1,672,776
Revenue from external customers 83,353,940 66,317,353 57,326,612
Depreciation and amortisation 4,258,909 4,130,004 3,990,464
Interest income 92,380 67,076 36,831
Interest expense 2,826,916 1,420,802 678,986
Employee benefit expense 127,038 180,114 193,412
Loss on abandonment of property, plant and equipment 182,742 157,784 202,262
Increase in provisions, net 419,564 611,534 1,194,643
Operating profit (loss) (6,153,936) (33,623,874) (7,244,319)
Profit (loss) related to associates and joint ventures 314,373 980,146 391,116
Segment assets 138,838,342 131,023,727  
Investments in associates and joint ventures 5,872,000 5,678,141  
Acquisition of non-current assets 7,636,677 6,055,179  
Segment liabilities 120,181,250 108,963,058  
Operating segments | Electric power generation (Nuclear)      
Disclosure of operating segments [line items]      
Total segment revenue 10,798,378 10,386,091 9,324,391
Intersegment revenue 10,666,260 10,254,271 9,207,516
Revenue from external customers 132,118 131,820 116,875
Depreciation and amortisation 4,403,610 4,034,774 3,611,594
Interest income 69,209 45,789 22,209
Interest expense 687,743 557,218 477,512
Employee benefit expense 62,280 82,466 86,730
Loss on abandonment of property, plant and equipment 0 0 0
Increase in provisions, net 585,630 624,221 680,358
Operating profit (loss) 819,838 761,109 762,164
Profit (loss) related to associates and joint ventures (2,639) (753) (18,146)
Segment assets 70,535,018 69,129,625  
Investments in associates and joint ventures 169,155 143,304  
Acquisition of non-current assets 3,070,528 2,008,409  
Segment liabilities 45,660,916 42,843,974  
Operating segments | Electric power generation (Non-nuclear)      
Disclosure of operating segments [line items]      
Total segment revenue 35,159,641 41,944,339 25,928,596
Intersegment revenue 32,253,979 39,252,851 24,518,167
Revenue from external customers 2,905,662 2,691,488 1,410,429
Depreciation and amortisation 4,180,939 4,091,081 4,182,470
Interest income 65,403 53,242 22,226
Interest expense 741,282 694,559 624,391
Employee benefit expense 109,151 140,067 121,020
Loss on abandonment of property, plant and equipment 13,863 0 5,672
Increase in provisions, net 352,058 619,947 285,152
Operating profit (loss) 929,210 289,001 370,440
Profit (loss) related to associates and joint ventures 301,681 329,112 109,765
Segment assets 66,265,884 69,468,039  
Investments in associates and joint ventures 3,567,345 3,113,918  
Acquisition of non-current assets 3,490,863 3,547,815  
Segment liabilities 38,415,202 40,428,907  
Operating segments | Plant maintenance & engineering service      
Disclosure of operating segments [line items]      
Total segment revenue 3,091,022 2,975,062 2,805,785
Intersegment revenue 2,626,190 2,516,699 2,370,900
Revenue from external customers 464,832 458,363 434,885
Depreciation and amortisation 129,628 123,168 121,493
Interest income 23,638 14,003 9,515
Interest expense 1,270 1,405 933
Employee benefit expense 52,890 82,070 94,269
Loss on abandonment of property, plant and equipment 0 0 0
Increase in provisions, net 206,215 213,671 213,500
Operating profit (loss) 355,284 239,529 245,360
Profit (loss) related to associates and joint ventures (389) 1,886 11,849
Segment assets 4,271,409 4,051,157  
Investments in associates and joint ventures 54,088 56,685  
Acquisition of non-current assets 203,352 200,338  
Segment liabilities 1,549,863 1,272,408  
Operating segments | Others      
Disclosure of operating segments [line items]      
Total segment revenue 2,175,972 2,750,231 2,018,997
Intersegment revenue 1,556,114 1,803,231 1,295,423
Revenue from external customers 619,858 947,000 723,574
Depreciation and amortisation 204,322 211,719 159,222
Interest income 226,243 195,966 158,680
Interest expense 258,877 195,860 162,345
Employee benefit expense 48,105 53,017 52,698
Loss on abandonment of property, plant and equipment 92 3,125 0
Increase in provisions, net 444 9,463 2,981
Operating profit (loss) 89,302 333,547 208,139
Profit (loss) related to associates and joint ventures 0 0 0
Segment assets 13,378,229 12,895,981  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets 736,155 839,885  
Segment liabilities 6,480,959 5,796,718  
Material reconciling items      
Disclosure of operating segments [line items]      
Total segment revenue (48,831,145) (55,749,406) (39,064,782)
Intersegment revenue (48,831,145) (55,749,406) (39,064,782)
Revenue from external customers 0 0 0
Depreciation and amortisation (145,145) (129,334) (122,751)
Interest income (47,253) (35,323) (27,587)
Interest expense (64,429) (51,298) (29,710)
Employee benefit expense (40,734) (52,034) (36,187)
Loss on abandonment of property, plant and equipment 0 0 0
Increase in provisions, net 47,171 68,143 89,818
Operating profit (loss) (284,714) (239,843) (64,775)
Profit (loss) related to associates and joint ventures 0 0 ₩ 0
Segment assets (53,573,917) (51,763,535)  
Investments in associates and joint ventures 0 0  
Acquisition of non-current assets (390,686) (38,633)  
Segment liabilities ₩ (9,837,975) ₩ (6,500,327)