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Investments in Associates 3 (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Korea Gas Corporation    
Disclosure of associates [line items]    
Total assets ₩ 43,669,902 ₩ 35,909,775
Total liabilities 34,550,567 28,174,619
Sales of Associates 27,520,756 20,833,722
Profit (loss) for the period of Associates 950,757 (172,060)
Korea Electric Power Industrial Development Co., Ltd.    
Disclosure of associates [line items]    
Total assets 158,163 164,015
Total liabilities 73,278 75,636
Sales of Associates 312,705 297,962
Profit (loss) for the period of Associates 7,233 16,284
YTN Co., Ltd.    
Disclosure of associates [line items]    
Total assets 367,950 295,151
Total liabilities 126,062 105,923
Sales of Associates 137,439 126,730
Profit (loss) for the period of Associates 51,044 7,095
Gangwon Wind Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 71,153 77,297
Total liabilities 1,121 1,336
Sales of Associates 19,623 23,350
Profit (loss) for the period of Associates 5,433 7,472
Hyundai Green Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 812,287 874,574
Total liabilities 391,754 416,732
Sales of Associates 101,818 390,442
Profit (loss) for the period of Associates (280) 55,591
Korea Power Exchange    
Disclosure of associates [line items]    
Total assets 331,640 337,577
Total liabilities 61,912 68,455
Sales of Associates 110,075 104,698
Profit (loss) for the period of Associates 492 979
Taebaek Wind Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 30,375 28,048
Total liabilities 3,176 2,480
Sales of Associates 5,744 4,364
Profit (loss) for the period of Associates 1,588 (561)
Taeback Guinemi Wind Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 43,411 44,434
Total liabilities 29,985 32,085
Sales of Associates 5,910 5,023
Profit (loss) for the period of Associates 1,371 1,368
Pyeongchang Wind Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 69,939 72,713
Total liabilities 48,295 52,606
Sales of Associates 10,087 8,387
Profit (loss) for the period of Associates 1,537 (154)
Daeryun Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 757,157 789,277
Total liabilities 476,152 498,346
Sales of Associates 188,193 126,343
Profit (loss) for the period of Associates (10,232) 1,941
Changjuk Wind Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 29,539 27,515
Total liabilities 1,690 1,292
Sales of Associates 6,213 4,777
Profit (loss) for the period of Associates 3,265 656
KNH Solar Co., Ltd.    
Disclosure of associates [line items]    
Total assets 13,859 18,240
Total liabilities 5,423 9,219
Sales of Associates 3,222 3,564
Profit (loss) for the period of Associates 805 728
SPC Power Corporation    
Disclosure of associates [line items]    
Total assets 242,058 255,462
Total liabilities 18,535 17,705
Sales of Associates 54,042 47,091
Profit (loss) for the period of Associates 35,441 39,677
Gemeng International Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 8,151,333 7,427,157
Total liabilities 5,976,164 5,428,013
Sales of Associates 2,511,377 1,955,707
Profit (loss) for the period of Associates (404,570) 64,077
PT. Cirebon Electric Power    
Disclosure of associates [line items]    
Total assets 697,614 730,020
Total liabilities 254,089 301,615
Sales of Associates 273,650 246,014
Profit (loss) for the period of Associates 39,965 40,676
KNOC Nigerian East Oil Co., Ltd.    
Disclosure of associates [line items]    
Total assets 24,693 22,215
Total liabilities 102,722 93,736
Sales of Associates 0 0
Profit (loss) for the period of Associates (99) (142)
KNOC Nigerian West Oil Co., Ltd.    
Disclosure of associates [line items]    
Total assets 26,625 23,999
Total liabilities 98,360 89,739
Sales of Associates 0 0
Profit (loss) for the period of Associates (99) (142)
PT Wampu Electric Power    
Disclosure of associates [line items]    
Total assets 209,172 199,841
Total liabilities 132,917 139,264
Sales of Associates 20,294 20,265
Profit (loss) for the period of Associates 7,102 7,372
PT. Bayan Resources TBK    
Disclosure of associates [line items]    
Total assets 2,884,474 1,544,875
Total liabilities 743,452 795,131
Sales of Associates 3,264,057 1,646,390
Profit (loss) for the period of Associates 1,456,893 219,406
S-Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 856,963 782,561
Total liabilities 603,519 554,393
Sales of Associates 608,259 421,519
Profit (loss) for the period of Associates 24,998 (10,805)
Pioneer Gas Power Limited    
Disclosure of associates [line items]    
Total assets 282,577 260,344
Total liabilities 438,366 359,790
Sales of Associates 0 0
Profit (loss) for the period of Associates (36,864) (44,568)
Eurasia Energy Holdings    
Disclosure of associates [line items]    
Total assets 606 556
Total liabilities 1,082 993
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 1,321,406 1,138,994
Total liabilities 947,430 876,336
Sales of Associates 161,686 140,069
Profit (loss) for the period of Associates 76,996 (11,318)
Hadong Mineral Fiber Co., Ltd.    
Disclosure of associates [line items]    
Total assets   203
Total liabilities   231
Sales of Associates   0
Profit (loss) for the period of Associates   0
PT. Mutiara Jawa    
Disclosure of associates [line items]    
Total assets 24,355 23,061
Total liabilities 15,498 16,923
Sales of Associates 10,958 7,946
Profit (loss) for the period of Associates 2,835 2,523
Samcheok Eco Materials Co., Ltd.    
Disclosure of associates [line items]    
Total assets 26,545 24,024
Total liabilities 1,854 598
Sales of Associates 14,281 10,483
Profit (loss) for the period of Associates 1,237 23
Noeul Green Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 109,354 116,929
Total liabilities 96,222 102,457
Sales of Associates 36,029 27,486
Profit (loss) for the period of Associates (1,269) (8,303)
Goseong Green Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 5,412,537 4,559,480
Total liabilities 4,509,791 4,351,119
Sales of Associates 740,028 0
Profit (loss) for the period of Associates 51,450 (12,280)
Gangneung Eco Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 4,001,681 2,630,752
Total liabilities 3,851,537 2,475,848
Sales of Associates 0 0
Profit (loss) for the period of Associates (4,188) (3,623)
Shin Pyeongtaek Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 1,028,028 1,020,650
Total liabilities 764,551 814,369
Sales of Associates 653,117 520,468
Profit (loss) for the period of Associates 57,202 32,002
Haeng Bok Do Si Photovoltaic Power Co Ltd    
Disclosure of associates [line items]    
Total assets 1,823 2,001
Total liabilities 1,033 1,258
Sales of Associates 426 387
Profit (loss) for the period of Associates 46 (11)
Dongducheon Dream Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 1,398,244 1,374,640
Total liabilities 1,139,521 1,095,926
Sales of Associates 750,127 524,890
Profit (loss) for the period of Associates (16,685) 10,982
Jinbhuvish Power Generation Pvt. Ltd.    
Disclosure of associates [line items]    
Total assets 62,926 58,699
Total liabilities 12,995 12,122
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 5,321 6,281
Total liabilities 1,664 1,634
Sales of Associates 0 0
Profit (loss) for the period of Associates (149) (810)
GS Donghae Electric Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 2,149,060 2,174,835
Total liabilities 1,432,083 1,455,935
Sales of Associates 760,323 685,579
Profit (loss) for the period of Associates 44,035 41,955
Daegu Photovoltaic Co., Ltd.    
Disclosure of associates [line items]    
Total assets 13,046 13,843
Total liabilities 4,970 6,718
Sales of Associates 3,519 3,343
Profit (loss) for the period of Associates 1,621 1,149
Busan Green Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 163,016 170,261
Total liabilities 145,664 139,995
Sales of Associates 45,088 40,241
Profit (loss) for the period of Associates (10,843) (6,422)
Gunsan Bio Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 8,503 9,340
Total liabilities 28,981 28,322
Sales of Associates 0 0
Profit (loss) for the period of Associates (1,496) (1,501)
Korea Electric Vehicle Charging Service    
Disclosure of associates [line items]    
Total assets 13,351 8,173
Total liabilities 6,207 6,116
Sales of Associates 13,808 10,807
Profit (loss) for the period of Associates (1,022) (1,756)
Korea Nuclear Partners Co., Ltd.    
Disclosure of associates [line items]    
Total assets   1,350
Total liabilities   105
Sales of Associates   1,062
Profit (loss) for the period of Associates   (150)
Korea Electric Power Corporation Fund    
Disclosure of associates [line items]    
Total assets 49,150 42,988
Total liabilities 237 249
Sales of Associates 9,773 82
Profit (loss) for the period of Associates 9,534 (730)
Energy Infra Asset Management Co., Ltd.    
Disclosure of associates [line items]    
Total assets 11,196 10,424
Total liabilities 426 946
Sales of Associates 4,703 5,130
Profit (loss) for the period of Associates 1,306 1,488
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)
Yaksu ESS Co., Ltd.    
Disclosure of associates [line items]    
Total assets 6,999 6,584
Total liabilities 4,535 5,022
Sales of Associates 1,715 217
Profit (loss) for the period of Associates 903 (212)
Nepal Water & Energy Development Company Private Ltd    
Disclosure of associates [line items]    
Total assets 153,184 109,321
Total liabilities 58,545 41,093
Sales of Associates 0 0
Profit (loss) for the period of Associates (642) (444)
Gwangyang Green Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 128,375 28,634
Total liabilities 1,136 24,095
Sales of Associates 0 0
Profit (loss) for the period of Associates (688) (113)
PND Solar Co., Ltd.    
Disclosure of associates [line items]    
Total assets 37,152 38,997
Total liabilities 33,444 35,566
Sales of Associates 5,078 5,129
Profit (loss) for the period of Associates (128) (121)
Hyundai Ecoenergy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 186,309 195,040
Total liabilities 158,111 173,800
Sales of Associates 25,762 24,166
Profit (loss) for the period of Associates 6,921 4,280
YeongGwang Yaksu Wind Electric Co., Ltd.    
Disclosure of associates [line items]    
Total assets 40,484 43,039
Total liabilities 41,176 42,915
Sales of Associates 7,066 5,802
Profit (loss) for the period of Associates (914) (637)
Green Energy Electricity Generation Co., Ltd.    
Disclosure of associates [line items]    
Total assets 75,664 53,934
Total liabilities 72,442 56,533
Sales of Associates 2,796 0
Profit (loss) for the period of Associates (58) (920)
Korea Energy Solution Co., Ltd.    
Disclosure of associates [line items]    
Total assets 654 1,009
Total liabilities 40 25
Sales of Associates 228 78
Profit (loss) for the period of Associates (347) (280)
ITR Co., Ltd.    
Disclosure of associates [line items]    
Total assets 529 418
Total liabilities 372 220
Sales of Associates 135 153
Profit (loss) for the period of Associates (29) (66)
Structure test network Co., Ltd.    
Disclosure of associates [line items]    
Total assets 1,665 101
Total liabilities 400 234
Sales of Associates 1,451 99
Profit (loss) for the period of Associates 1,134 27
Namjeongsusang Solar Power Operation Co., Ltd.    
Disclosure of associates [line items]    
Total assets 56,376 63,041
Total liabilities 54,104 62,488
Sales of Associates 7,095 1,128
Profit (loss) for the period of Associates (1,280) (4,655)
Indeck Niles Development, LLC    
Disclosure of associates [line items]    
Total assets 1,051,557 772,124
Total liabilities 729,078 738,826
Sales of Associates 0 0
Profit (loss) for the period of Associates (25,184) (29,392)
Indeck Niles Asset Management, LLC    
Disclosure of associates [line items]    
Total assets 347 314
Total liabilities 13 11
Sales of Associates 2,232 2,272
Profit (loss) for the period of Associates 1,135 1,139
Hanwha Corporation-linked Sunlight Power Special Private Equity Investment Trust No. 1    
Disclosure of associates [line items]    
Total assets 14,778 15,157
Total liabilities 211 206
Sales of Associates 848 634
Profit (loss) for the period of Associates 815 603
Suwon New Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 1,997 1,974
Total liabilities 30 8
Sales of Associates 0 0
Profit (loss) for the period of Associates 2 0
KPGE Inc.    
Disclosure of associates [line items]    
Total assets 1,086 1,021
Total liabilities 20 32
Sales of Associates 709 354
Profit (loss) for the period of Associates 77 5
Gwangbaek Solar Power Investment Co., Ltd.    
Disclosure of associates [line items]    
Total assets 320,001 339,223
Total liabilities 309,796 329,298
Sales of Associates 14,615 13,192
Profit (loss) for the period of Associates 125 (329)
Go deok Clean Energy Co., Ltd    
Disclosure of associates [line items]    
Total assets 65,566 1,639
Total liabilities 54,811 65
Sales of Associates 0 0
Profit (loss) for the period of Associates (2,482) (1,382)
SureDataLab Co., Ltd.    
Disclosure of associates [line items]    
Total assets 612 400
Total liabilities 79 47
Sales of Associates 733 303
Profit (loss) for the period of Associates 205 (108)
SEP Co., Ltd.    
Disclosure of associates [line items]    
Total assets 132 164
Total liabilities 100 100
Sales of Associates 0 0
Profit (loss) for the period of Associates (2) (63)
Hankook Electric Power Information Co., Ltd.    
Disclosure of associates [line items]    
Total assets 1,512 1,163
Total liabilities 876 613
Sales of Associates 1,887 1,208
Profit (loss) for the period of Associates 229 390
Tronix Co., Ltd.    
Disclosure of associates [line items]    
Total assets 1,002 942
Total liabilities 455 349
Sales of Associates 2,228 2,030
Profit (loss) for the period of Associates 89 (6)
O2&B Global Co., Ltd.    
Disclosure of associates [line items]    
Total assets 231 233
Total liabilities 54 125
Sales of Associates 345 285
Profit (loss) for the period of Associates 3 (57)
Muan Sunshine Solar Power Plant Co., Ltd.    
Disclosure of associates [line items]    
Total assets 142,858 147,908
Total liabilities 138,987 144,898
Sales of Associates 15,582 6,017
Profit (loss) for the period of Associates (156) (2,365)
Bigeum Resident Photovoltaic Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 22,159 11,164
Total liabilities 23,158 11,551
Sales of Associates 0 0
Profit (loss) for the period of Associates (608) (309)
Jeju SolarOne Co., Ltd.    
Disclosure of associates [line items]    
Total assets   1,608
Total liabilities   14
Sales of Associates   0
Profit (loss) for the period of Associates   (4)
Goesan Solar Park Co., Ltd.    
Disclosure of associates [line items]    
Total assets 52,443 56,332
Total liabilities 45,799 50,524
Sales of Associates 6,388 2,809
Profit (loss) for the period of Associates 836 (262)
Saemangeum Heemang Photovoltaic Co.,Ltd.    
Disclosure of associates [line items]    
Total assets 157,298 35,447
Total liabilities 130,158 6,070
Sales of Associates 902 0
Profit (loss) for the period of Associates (2,237) (1,943)
Bitgoel Eco Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 51,471 100
Total liabilities 36,450 0
Sales of Associates 0 0
Profit (loss) for the period of Associates (900) 0
Jeju Gimnyeong Wind Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 65,754 72,557
Total liabilities 62,716 67,297
Sales of Associates 6,915 8,927
Profit (loss) for the period of Associates (2,085) (1,576)
Seoroseoro Sunny Power Plant Co., Ltd.    
Disclosure of associates [line items]    
Total assets 5,833 1,182
Total liabilities 4,186 0
Sales of Associates 469 0
Profit (loss) for the period of Associates 36 0
Muan Solar Park Co., Ltd.    
Disclosure of associates [line items]    
Total assets 226,920 245,431
Total liabilities 198,132 225,057
Sales of Associates 30,990 14,359
Profit (loss) for the period of Associates 8,639 (966)
YuDang Solar Co., Ltd.    
Disclosure of associates [line items]    
Total assets 22,430 23,360
Total liabilities 19,604 20,876
Sales of Associates 3,452 1,611
Profit (loss) for the period of Associates 626 686
Anjwa Smart Farm & Solar City Co., Ltd.    
Disclosure of associates [line items]    
Total assets 278,981 295,570
Total liabilities 249,143 271,396
Sales of Associates 37,691 1,900
Profit (loss) for the period of Associates 5,996 (1,684)
Daewon Green Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 131,218 15,370
Total liabilities 116,100 122
Sales of Associates 18 0
Profit (loss) for the period of Associates (130) ₩ (93)
Hansuwon KNP Co., Ltd. (formerly, Korea Nuclear Partners Co., Ltd.)    
Disclosure of associates [line items]    
Total assets 1,409  
Total liabilities 100  
Sales of Associates 836  
Profit (loss) for the period of Associates 64  
G.GURU Co., Ltd.    
Disclosure of associates [line items]    
Total assets 1,644  
Total liabilities 8  
Sales of Associates 58  
Profit (loss) for the period of Associates (346)  
UD4M Co., Ltd.    
Disclosure of associates [line items]    
Total assets 1,359  
Total liabilities 205  
Sales of Associates 1,004  
Profit (loss) for the period of Associates 196  
Dongbu Highway Solar Co., Ltd.    
Disclosure of associates [line items]    
Total assets 18,794  
Total liabilities 17,721  
Sales of Associates 2,394  
Profit (loss) for the period of Associates 163  
Seobu Highway Solar Co., Ltd.    
Disclosure of associates [line items]    
Total assets 19,828  
Total liabilities 18,384  
Sales of Associates 2,647  
Profit (loss) for the period of Associates 315  
Korea Energy Data Co., Ltd.    
Disclosure of associates [line items]    
Total assets 238  
Total liabilities 27  
Sales of Associates 86  
Profit (loss) for the period of Associates 6  
Gangneung Sacheon Fuel Cell Co., Ltd.    
Disclosure of associates [line items]    
Total assets 2,758  
Total liabilities 3  
Sales of Associates 0  
Profit (loss) for the period of Associates (123)  
Kosture Co., Ltd.    
Disclosure of associates [line items]    
Total assets 150  
Total liabilities 26  
Sales of Associates 166  
Profit (loss) for the period of Associates 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 166,172  
Total liabilities 124,570  
Sales of Associates 22,773  
Profit (loss) for the period of Associates 8,732  
Chuncheon Green Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 4,901  
Total liabilities 20  
Sales of Associates 0  
Profit (loss) for the period of Associates (101)  
Yeomsubong Wind Power Co., Ltd.    
Disclosure of associates [line items]    
Total assets 400  
Total liabilities 396  
Sales of Associates 0  
Profit (loss) for the period of Associates (17)  
Yeongyang Wind Power Corporation II    
Disclosure of associates [line items]    
Total assets 28,972  
Total liabilities 9,456  
Sales of Associates 0  
Profit (loss) for the period of Associates (1,233)  
Haeparang Energy Co., Ltd.    
Disclosure of associates [line items]    
Total assets 9,566  
Total liabilities 681  
Sales of Associates 0  
Profit (loss) for the period of Associates (2)  
Saemangeum Sebit Power Plant Co., Ltd.    
Disclosure of associates [line items]    
Total assets 105,259  
Total liabilities 96,963  
Sales of Associates 0  
Profit (loss) for the period of Associates ₩ (190)