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Investments in Associates 3 (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Korea Gas Corporation    
Disclosure of associates [line items]    
Total assets ₩ 62,424,983 [1] ₩ 43,669,902 [2]
Total liabilities 52,014,243 [1] 34,550,567 [2]
Sales of Associates 51,724,287 [1] 27,520,756 [2]
Profit (loss) for the period of Associates 1,497,008 [1] 950,757 [2]
Korea Electric Power Industrial Development Co., Ltd.    
Disclosure of associates [line items]    
Total assets 148,112 158,163
Total liabilities 40,946 73,278
Sales of Associates 336,333 312,705
Profit (loss) for the period of Associates 15,434 7,233
YTN Co., Ltd.    
Disclosure of associates [line items]    
Total assets 364,115 367,950
Total liabilities 107,324 126,062
Sales of Associates 152,187 137,439
Profit (loss) for the period of Associates 7,250 51,044
Gangwon Wind Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 86,758 71,153
Total liabilities 6,029 1,121
Sales of Associates 40,130 19,623
Profit (loss) for the period of Associates 20,163 5,433
Hyundai Green Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 773,998 812,287
Total liabilities 360,926 391,754
Sales of Associates 105,374 101,818
Profit (loss) for the period of Associates 5,010 (280)
Korea Power Exchange    
Disclosure of associates [line items]    
Total assets 311,691 331,640
Total liabilities 36,564 61,912
Sales of Associates 118,501 110,075
Profit (loss) for the period of Associates 1,036 492
Taebaek Wind Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 27,562 30,375
Total liabilities 3,394 3,176
Sales of Associates 7,565 5,744
Profit (loss) for the period of Associates 551 1,588
Taebaek Guinemi Wind Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 44,036 43,411
Total liabilities 28,709 29,985
Sales of Associates 6,793 5,910
Profit (loss) for the period of Associates 1,906 1,371
Pyeongchang Wind Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets   69,939
Total liabilities   48,295
Sales of Associates   10,087
Profit (loss) for the period of Associates   1,537
Daeryun Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 1,201,510 757,157
Total liabilities 799,370 476,152
Sales of Associates 472,211 188,193
Profit (loss) for the period of Associates 4,999 (10,232)
Changjuk Wind Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets   29,539
Total liabilities   1,690
Sales of Associates   6,213
Profit (loss) for the period of Associates   3,265
KNH Solar Co., Ltd.    
Disclosure of associates [line items]    
Total assets 13,584 13,859
Total liabilities 2,905 5,423
Sales of Associates 4,348 3,222
Profit (loss) for the period of Associates 2,173 805
SPC Power Corporation    
Disclosure of associates [line items]    
Total assets 254,951 242,058
Total liabilities 26,417 18,535
Sales of Associates 80,630 54,042
Profit (loss) for the period of Associates 25,614 35,441
Gemeng International Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 7,796,180 8,151,333
Total liabilities 5,460,183 5,976,164
Sales of Associates 3,183,398 2,511,377
Profit (loss) for the period of Associates 11,637 (404,570)
PT. Cirebon Electric Power    
Disclosure of associates [line items]    
Total assets 691,311 697,614
Total liabilities 199,987 254,089
Sales of Associates 287,261 273,650
Profit (loss) for the period of Associates 53,730 39,965
KNOC Nigerian East Oil Co., Ltd.    
Disclosure of associates [line items]    
Total assets 26,491 24,693
Total liabilities 109,974 102,722
Sales of Associates 0 0
Profit (loss) for the period of Associates (72) (99)
KNOC Nigerian West Oil Co., Ltd.    
Disclosure of associates [line items]    
Total assets 28,537 26,625
Total liabilities 105,292 98,360
Sales of Associates 0 0
Profit (loss) for the period of Associates (72) (99)
PT Wampu Electric Power    
Disclosure of associates [line items]    
Total assets 209,815 209,172
Total liabilities 127,764 132,917
Sales of Associates 21,773 20,294
Profit (loss) for the period of Associates 12,713 7,102
PT. Bayan Resources TBK    
Disclosure of associates [line items]    
Total assets 4,994,538 2,884,474
Total liabilities 2,518,129 743,452
Sales of Associates 6,076,844 3,264,057
Profit (loss) for the period of Associates 3,042,123 1,456,893
S-Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 937,067 856,963
Total liabilities 646,411 603,519
Sales of Associates 1,091,425 608,259
Profit (loss) for the period of Associates 37,104 24,998
Pioneer Gas Power Limited    
Disclosure of associates [line items]    
Total assets 271,340 282,577
Total liabilities 477,127 438,366
Sales of Associates 0 0
Profit (loss) for the period of Associates (46,290) (36,864)
Eurasia Energy Holdings    
Disclosure of associates [line items]    
Total assets 648 606
Total liabilities 1,156 1,082
Sales of Associates 0 0
Profit (loss) for the period of Associates 0 0
Xe-Pian Xe-Namnoy Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 1,371,292 1,321,406
Total liabilities 904,907 947,430
Sales of Associates 174,693 161,686
Profit (loss) for the period of Associates 61,020 76,996
PT. Mutiara Jawa    
Disclosure of associates [line items]    
Total assets 26,024 24,355
Total liabilities 13,622 15,498
Sales of Associates 15,421 10,958
Profit (loss) for the period of Associates 4,912 2,835
Samcheok Eco Materials Co., Ltd.    
Disclosure of associates [line items]    
Total assets 24,952 26,545
Total liabilities 1,609 1,854
Sales of Associates 11,907 14,281
Profit (loss) for the period of Associates (1,127) 1,237
Noeul Green Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 82,611 109,354
Total liabilities 101,472 96,222
Sales of Associates 23,493 36,029
Profit (loss) for the period of Associates (31,970) (1,269)
Goseong Green Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 5,518,258 5,483,090
Total liabilities 4,516,607 4,508,569
Sales of Associates 1,999,825 988,933
Profit (loss) for the period of Associates 26,981 124,639
Gangneung Eco Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 4,907,872 4,001,681
Total liabilities 4,900,408 3,851,537
Sales of Associates 435,755 0
Profit (loss) for the period of Associates (142,387) (4,188)
Shin Pyeongtaek Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 1,203,406 1,028,028
Total liabilities 839,568 764,551
Sales of Associates 957,062 653,117
Profit (loss) for the period of Associates 100,554 57,202
Haeng Bok Do Si Photovoltaic Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 1,788 1,823
Total liabilities 802 1,033
Sales of Associates 558 426
Profit (loss) for the period of Associates 200 46
Dongducheon Dream Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 1,521,089 1,398,244
Total liabilities 1,219,018 1,139,521
Sales of Associates 2,240,175 750,127
Profit (loss) for the period of Associates 43,072 (16,685)
Jinbhuvish Power Generation Pvt. Ltd.    
Disclosure of associates [line items]    
Total assets 60,477 62,926
Total liabilities 12,489 12,995
Sales of Associates 0 0
Profit (loss) for the period of Associates 0 0
Daejung Offshore Wind Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 5,350 5,321
Total liabilities 2,013 1,664
Sales of Associates 0 0
Profit (loss) for the period of Associates (228) (149)
GS Donghae Electric Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 2,130,287 2,149,060
Total liabilities 1,365,156 1,432,083
Sales of Associates 1,053,112 760,323
Profit (loss) for the period of Associates 46,226 44,035
Daegu Photovoltaic Co., Ltd.    
Disclosure of associates [line items]    
Total assets 13,254 13,046
Total liabilities 3,431 4,970
Sales of Associates 4,755 3,519
Profit (loss) for the period of Associates 2,914 1,621
Busan Green Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 168,588 163,016
Total liabilities 153,432 145,664
Sales of Associates 72,290 45,088
Profit (loss) for the period of Associates (7,409) (10,843)
Gunsan Bio Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 8,397 8,503
Total liabilities 29,524 28,981
Sales of Associates 0 0
Profit (loss) for the period of Associates (649) (1,496)
Korea Electric Vehicle Charging Service    
Disclosure of associates [line items]    
Total assets   13,351
Total liabilities   6,207
Sales of Associates   13,808
Profit (loss) for the period of Associates   (1,022)
Hansuwon KNP Co., Ltd. (formerly, Korea Nuclear Partners Co., Ltd.)    
Disclosure of associates [line items]    
Total assets 1,887 1,409
Total liabilities 368 100
Sales of Associates 2,149 836
Profit (loss) for the period of Associates 210 64
Korea Electric Power Corporation Fund    
Disclosure of associates [line items]    
Total assets 29,530 49,150
Total liabilities 130 237
Sales of Associates 8,034 9,773
Profit (loss) for the period of Associates 7,854 9,534
Energy Infra Asset Management Co., Ltd.    
Disclosure of associates [line items]    
Total assets 12,874 11,196
Total liabilities 918 426
Sales of Associates 4,954 4,703
Profit (loss) for the period of Associates 1,354 1,306
Daegu clean Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 368 368
Total liabilities 324 324
Sales of Associates 0 0
Profit (loss) for the period of Associates (1) (1)
YaksuESS Co., Ltd.    
Disclosure of associates [line items]    
Total assets   6,999
Total liabilities   4,535
Sales of Associates   1,715
Profit (loss) for the period of Associates   903
YaksuESS Co., Ltd    
Disclosure of associates [line items]    
Total assets 5,984  
Total liabilities 4,314  
Sales of Associates 851  
Profit (loss) for the period of Associates (146)  
Nepal Water & Energy Development Company Private Limited    
Disclosure of associates [line items]    
Total assets 241,061 153,184
Total liabilities 141,199 58,545
Sales of Associates 70,923 0
Profit (loss) for the period of Associates (1,364) (642)
Gwangyang Green Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 170,390 128,375
Total liabilities 45,260 1,136
Sales of Associates 0 0
Profit (loss) for the period of Associates (1,923) (688)
PND Solar Co., Ltd.    
Disclosure of associates [line items]    
Total assets 36,174 37,152
Total liabilities 31,868 33,444
Sales of Associates 5,940 5,078
Profit (loss) for the period of Associates 217 (128)
Hyundai Eco Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 181,566 186,309
Total liabilities 142,533 158,111
Sales of Associates 29,209 25,762
Profit (loss) for the period of Associates 10,270 6,921
YeongGwang Yaksu Wind Electric Co., Ltd.    
Disclosure of associates [line items]    
Total assets 40,712 40,484
Total liabilities 39,924 41,176
Sales of Associates 6,628 7,066
Profit (loss) for the period of Associates 1,480 (914)
Green Energy Electricity Generation Co., Ltd.    
Disclosure of associates [line items]    
Total assets 75,033 75,664
Total liabilities 72,300 72,442
Sales of Associates 1,404 2,796
Profit (loss) for the period of Associates (488) (58)
Korea Energy Solutions Co., Ltd.    
Disclosure of associates [line items]    
Total assets 843 654
Total liabilities 377 40
Sales of Associates 437 228
Profit (loss) for the period of Associates (185) (347)
ITR Co., Ltd.    
Disclosure of associates [line items]    
Total assets 446 529
Total liabilities 472 372
Sales of Associates 188 135
Profit (loss) for the period of Associates (190) (29)
Structure test network Co., Ltd.    
Disclosure of associates [line items]    
Total assets 1,948 1,665
Total liabilities 383 400
Sales of Associates 732 1,451
Profit (loss) for the period of Associates 202 1,134
Namjeongsusang Solar Power Operation Co., Ltd.    
Disclosure of associates [line items]    
Total assets 55,616 56,376
Total liabilities 53,261 54,104
Sales of Associates 7,724 7,095
Profit (loss) for the period of Associates 83 (1,280)
Indeck Niles Development, LLC    
Disclosure of associates [line items]    
Total assets 1,178,303 1,051,557
Total liabilities 762,139 729,078
Sales of Associates 302,041 0
Profit (loss) for the period of Associates (22,541) (25,184)
Indeck Niles Asset Management, LLC    
Disclosure of associates [line items]    
Total assets 299 347
Total liabilities 16 13
Sales of Associates 1,863 2,232
Profit (loss) for the period of Associates 1,136 1,135
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1    
Disclosure of associates [line items]    
Total assets 14,356 14,778
Total liabilities 210 211
Sales of Associates 826 848
Profit (loss) for the period of Associates 796 815
Suwon New Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 2,142 1,997
Total liabilities 164 30
Sales of Associates 0 0
Profit (loss) for the period of Associates 11 2
KPGE Inc.    
Disclosure of associates [line items]    
Total assets   1,086
Total liabilities   20
Sales of Associates   709
Profit (loss) for the period of Associates   77
Gwangbaek Solar Power Investment Co., Ltd.    
Disclosure of associates [line items]    
Total assets 307,864 320,001
Total liabilities 296,915 309,796
Sales of Associates 10,270 14,615
Profit (loss) for the period of Associates 743 125
Go deok Clean Energy Co., Ltd    
Disclosure of associates [line items]    
Total assets 71,431 65,566
Total liabilities 60,382 54,811
Sales of Associates 0 0
Profit (loss) for the period of Associates (1,101) (2,482)
SureDataLab Co., Ltd.    
Disclosure of associates [line items]    
Total assets 879 612
Total liabilities 140 79
Sales of Associates 938 733
Profit (loss) for the period of Associates 203 205
SEP Co., Ltd.    
Disclosure of associates [line items]    
Total assets 38 132
Total liabilities 103 100
Sales of Associates 0 0
Profit (loss) for the period of Associates (98) (2)
Hankook Electric Power Information Co., Ltd.    
Disclosure of associates [line items]    
Total assets 2,334 1,512
Total liabilities 997 876
Sales of Associates 1,797 1,887
Profit (loss) for the period of Associates 392 229
Tronix Co., Ltd.    
Disclosure of associates [line items]    
Total assets 2,880 1,002
Total liabilities 2,354 455
Sales of Associates 1,938 2,228
Profit (loss) for the period of Associates (226) 89
O2&B Global Co., Ltd.    
Disclosure of associates [line items]    
Total assets 419 231
Total liabilities 238 54
Sales of Associates 220 345
Profit (loss) for the period of Associates 5 3
Muan Sunshine Solar Power Plant Co., Ltd.    
Disclosure of associates [line items]    
Total assets 142,911 142,858
Total liabilities 132,573 138,987
Sales of Associates 19,591 15,582
Profit (loss) for the period of Associates 6,467 (156)
Bigeum Resident Photovoltaic Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 107,690 22,159
Total liabilities 109,229 23,158
Sales of Associates 0 0
Profit (loss) for the period of Associates (537) (608)
Goesan Solar Park Co., Ltd.    
Disclosure of associates [line items]    
Total assets 52,235 52,443
Total liabilities 43,299 45,799
Sales of Associates 7,642 6,388
Profit (loss) for the period of Associates 2,292 836
Saemangeum Heemang Photovoltaic Co., Ltd.    
Disclosure of associates [line items]    
Total assets 160,695 157,298
Total liabilities 125,635 130,158
Sales of Associates 29,543 902
Profit (loss) for the period of Associates 6,481 (2,237)
Bitgoel Eco Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 85,236 51,471
Total liabilities 66,987 36,450
Sales of Associates 10,054 0
Profit (loss) for the period of Associates 3,229 (900)
Jeju Gimnyeong Wind Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 63,471 65,754
Total liabilities 60,564 62,716
Sales of Associates 12,231 6,915
Profit (loss) for the period of Associates (130) (2,085)
Seoroseoro Sunny Power Plant Co., Ltd.    
Disclosure of associates [line items]    
Total assets 7,015 5,833
Total liabilities 5,045 4,186
Sales of Associates 1,157 469
Profit (loss) for the period of Associates 247 36
Muan Solar Park Co., Ltd.    
Disclosure of associates [line items]    
Total assets 225,894 226,920
Total liabilities 188,329 198,132
Sales of Associates 36,081 30,990
Profit (loss) for the period of Associates 11,339 8,639
YuDang Solar Co., Ltd.    
Disclosure of associates [line items]    
Total assets 22,073 22,430
Total liabilities 19,144 19,604
Sales of Associates 3,997 3,452
Profit (loss) for the period of Associates 957 626
Anjwa Smart Farm & Solar City Co., Ltd.    
Disclosure of associates [line items]    
Total assets 278,806 278,981
Total liabilities 239,581 249,143
Sales of Associates 42,477 37,691
Profit (loss) for the period of Associates 9,672 5,996
Daewon Green Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 141,974 131,218
Total liabilities 124,460 116,100
Sales of Associates 45,095 18
Profit (loss) for the period of Associates 4,037 (130)
G.GURU Co., Ltd.    
Disclosure of associates [line items]    
Total assets 1,228 1,644
Total liabilities 12 8
Sales of Associates 478 58
Profit (loss) for the period of Associates (423) (346)
UD4M Co., Ltd.    
Disclosure of associates [line items]    
Total assets 1,322 1,359
Total liabilities 197 205
Sales of Associates 1,109 1,004
Profit (loss) for the period of Associates 59 196
Dongbu Highway Solar Co., Ltd.    
Disclosure of associates [line items]    
Total assets 17,935 18,794
Total liabilities 16,426 17,721
Sales of Associates 2,901 2,394
Profit (loss) for the period of Associates 439 163
Seobu Highway Solar Co., Ltd.    
Disclosure of associates [line items]    
Total assets 18,236 19,828
Total liabilities 16,655 18,384
Sales of Associates 3,052 2,647
Profit (loss) for the period of Associates 138 315
Korea Energy Data Co., Ltd.    
Disclosure of associates [line items]    
Total assets 339 238
Total liabilities 128 27
Sales of Associates 308 86
Profit (loss) for the period of Associates 5 6
Gangneung Sacheon Fuel Cell Co., Ltd.    
Disclosure of associates [line items]    
Total assets 108,688 2,758
Total liabilities 98,470 3
Sales of Associates 0 0
Profit (loss) for the period of Associates (2,720) (123)
Kosture Co., Ltd.    
Disclosure of associates [line items]    
Total assets 180 150
Total liabilities 24 26
Sales of Associates 293 166
Profit (loss) for the period of Associates 32 11
Digital Innovation Growth Fund    
Disclosure of associates [line items]    
Total assets   12,857
Total liabilities   0
Sales of Associates   4
Profit (loss) for the period of Associates   (143)
Taebaek Gadeoksan Wind Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 197,944 166,172
Total liabilities 139,004 124,570
Sales of Associates 31,534 22,773
Profit (loss) for the period of Associates 19,406 8,732
Chuncheon Green Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 159,151 4,901
Total liabilities 138,925 20
Sales of Associates 0 0
Profit (loss) for the period of Associates (858) (101)
Yeomsubong Wind Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 4,369 400
Total liabilities 2,829 396
Sales of Associates 0 0
Profit (loss) for the period of Associates (859) (17)
Yeongyang Wind Power Corporation II    
Disclosure of associates [line items]    
Total assets 104,821 28,972
Total liabilities 86,984 9,456
Sales of Associates 0 0
Profit (loss) for the period of Associates (1,678) (1,233)
Haeparang Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 19,394 9,566
Total liabilities 10,721 681
Sales of Associates 0 0
Profit (loss) for the period of Associates (211) (2)
Saemangeum Sebit Power Plant Co., Ltd.    
Disclosure of associates [line items]    
Total assets 167,822 105,259
Total liabilities 131,383 96,963
Sales of Associates 23,159 0
Profit (loss) for the period of Associates 7,742 ₩ (190)
Boulder Solar III, LLC    
Disclosure of associates [line items]    
Total assets 1,896  
Total liabilities 0  
Sales of Associates 0  
Profit (loss) for the period of Associates 0  
PlatformN. Co., Ltd    
Disclosure of associates [line items]    
Total assets 379  
Total liabilities 94  
Sales of Associates 486  
Profit (loss) for the period of Associates (70)  
PT. Cirebon Energi Prasarana    
Disclosure of associates [line items]    
Total assets 3,361,288  
Total liabilities 2,670,941  
Sales of Associates 319,986  
Profit (loss) for the period of Associates 36,451  
Green Radiation Co., Ltd    
Disclosure of associates [line items]    
Total assets 111  
Total liabilities 34  
Sales of Associates 89  
Profit (loss) for the period of Associates (93)  
Future Convergence Technology Laboratory. Co., Ltd    
Disclosure of associates [line items]    
Total assets 551  
Total liabilities 302  
Sales of Associates 9  
Profit (loss) for the period of Associates (130)  
SC E&G. Co,. Ltd    
Disclosure of associates [line items]    
Total assets 1,199  
Total liabilities 131  
Sales of Associates 1,048  
Profit (loss) for the period of Associates 609  
Wang San Engineering. Co,. Ltd    
Disclosure of associates [line items]    
Total assets 1,275  
Total liabilities 447  
Sales of Associates 754  
Profit (loss) for the period of Associates 499  
ACE    
Disclosure of associates [line items]    
Total assets 100  
Total liabilities 0  
Sales of Associates 0  
Profit (loss) for the period of Associates 0  
Environment and Energy Co., Ltd    
Disclosure of associates [line items]    
Total assets 93  
Total liabilities 0  
Sales of Associates 0  
Profit (loss) for the period of Associates (7)  
Santiago Solar Power SpA    
Disclosure of associates [line items]    
Total assets 56,138  
Total liabilities 29,390  
Sales of Associates 0  
Profit (loss) for the period of Associates (2,943)  
Yanggu Floating Photovoltaic Power Plant Inc    
Disclosure of associates [line items]    
Total assets 3,115  
Total liabilities 0  
Sales of Associates 0  
Profit (loss) for the period of Associates ₩ 0  
[1] The profit for the year ended December 31, 2022 is reduced by the associate entity’s net income (loss) attributable to non-controlling interests.
[2] The profit for the year ended December 31, 2021 is reduced by the associate entity’s net income (loss) attributable to non-controlling interests.