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Summary of financial information of consolidated subsidiaries (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Korea Hydro & Nuclear Power [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets ₩ 55,011,096 ₩ 52,782,915
Total liabilities 29,252,816 27,366,938
Sales 9,415,751 11,168,579
Profit (loss) for the period 854,346 2,454,810
Korea South-East Power [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 9,879,577 9,773,778
Total liabilities 4,844,184 4,794,330
Sales 5,387,846 5,093,598
Profit (loss) for the period 130,371 531,061
Korea Midland Power [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 9,893,822 9,066,666
Total liabilities 6,148,173 5,416,336
Sales 4,167,009 3,719,981
Profit (loss) for the period 104,591 400,696
Korea Western Power [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 9,660,426 9,810,714
Total liabilities 5,739,534 5,866,916
Sales 4,199,079 4,169,712
Profit (loss) for the period 110,939 401,936
Korea Southern Power [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 9,648,741 9,806,023
Total liabilities 5,401,216 5,637,950
Sales 4,397,552 4,200,035
Profit (loss) for the period 98,817 426,337
Korea East-West Power [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 8,855,518 8,967,951
Total liabilities 4,204,187 4,488,911
Sales 4,644,330 4,210,898
Profit (loss) for the period 217,599 467,603
KEPCO Engineering & Construction Company [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 762,166 786,596
Total liabilities 305,134 364,676
Sales 490,193 506,012
Profit (loss) for the period 21,222 17,796
KEPCO Plant Service & Engineering [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,195,086 1,086,421
Total liabilities 294,689 301,490
Sales 1,232,113 1,214,304
Profit (loss) for the period 135,482 86,657
KEPCO Nuclear Fuel [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 792,187 713,230
Total liabilities 421,088 346,012
Sales 279,664 309,911
Profit (loss) for the period 4,557 33,115
KEPCO KDN [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 524,520 519,901
Total liabilities 155,715 205,869
Sales 619,470 588,160
Profit (loss) for the period 48,968 43,127
Garolim Tidal Power Plant [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 619 632
Total liabilities 345 346
Profit (loss) for the period (12) (24)
KEPCO International HongKong [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 153,529 173,138
Total liabilities 1 41
Profit (loss) for the period 4,380 4,532
KEPCO International Philippines [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 102,323 114,141
Total liabilities 886 1,468
Profit (loss) for the period 47,201 56,783
KEPCO Gansu International [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 11,567 17,928
Total liabilities 493 557
Profit (loss) for the period (29) (18)
KEPCO Philippines Holdings [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 127,922 125,100
Total liabilities 2,621 27
Profit (loss) for the period 43,218 13,517
KEPCO Philippines Corporation [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 6,293 13,704
Total liabilities 114 8,949
Profit (loss) for the period 2,098 (8,717)
KEPCO Ilijan Corporation [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 474,624 558,030
Total liabilities 57,801 58,449
Sales 109,183 116,667
Profit (loss) for the period 66,320 51,552
KEPCO Lebanon SARL [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,069 1,458
Total liabilities 9,281 10,312
Profit (loss) for the period (219) 810
KEPCO Neimenggu International [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 165,937 186,636
Profit (loss) for the period 500 7,082
KEPCO Shanxi International [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 497,990 549,189
Total liabilities 193,309 218,047
Profit (loss) for the period 3,796 5,812
KOMIPO Global Pte [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 225,411 223,082
Total liabilities 1,497 1,095
Profit (loss) for the period 21,858 36,764
KEPCO Canada Energy [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 132 202
Total liabilities 22 24
Profit (loss) for the period (32) (27,216)
KEPCO Netherlands B.V. [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 114,911 128,014
Total liabilities 49 35
Profit (loss) for the period 17,309 224
KOREA Imouraren Uranium Investment Corp. [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 151,278 154,302
Total liabilities 131 764
Profit (loss) for the period 1,490 (68,417)
KEPCO Australia [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 466,654 503,657
Total liabilities 569 1,545
Sales   3,670
Profit (loss) for the period (568) (19,006)
KOSEP Australia [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 27,076 25,174
Total liabilities 333 521
Sales 12,096 5,357
Profit (loss) for the period 1,601 4,028
KOMIPO Australia [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 31,441 25,413
Total liabilities 4,691 10
Sales 12,096 5,388
Profit (loss) for the period 1,133 4,023
KOWEPO Australia [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 31,586 25,550
Total liabilities 4,691 10
Sales 12,096 5,357
Profit (loss) for the period 1,232 4,012
KOSPO Australia [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 29,472 25,625
Total liabilities 4,221 10
Sales 12,096 5,357
Profit (loss) for the period (2,759) 4,033
KEPCO Middle East Holding Company [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 95,812 128,846
Total liabilities 90,842 125,008
Profit (loss) for the period 2,913 6,840
Qatrana Electric Power Company [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 460,206 546,123
Total liabilities 327,401 417,800
Sales 18,892 18,866
Profit (loss) for the period 23,310 19,601
KHNP Canada Energy [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 51,994 54,374
Total liabilities 31 46
Profit (loss) for the period (92) (6,304)
KEPCO Bylong Australia [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 242,364 220,721
Total liabilities 277,549 277,358
Profit (loss) for the period 20,271 (2,357)
Korea Waterbury Uranium Limited Partnership [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 20,886 20,882
Total liabilities 136 149
Profit (loss) for the period (59) 2,348
Korea Electric Power Nigeria [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 238 696
Total liabilities 76 493
Sales 2,164 9,794
Profit (loss) for the period 29 35
KEPCO Holdings de Mexico [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 235 262
Total liabilities 30 19
Profit (loss) for the period (20) 251
KST Electric Power Company [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 546,242 596,823
Total liabilities 478,230 539,459
Sales 120,126 146,295
Profit (loss) for the period 16,154 17,322
KEPCO Energy Service Company [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,793 1,309
Total liabilities 451 310
Sales 6,773 5,337
Profit (loss) for the period 976 580
KEPCO Netherlands S3 B.V. [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 46,642 55,609
Total liabilities 53 54
Profit (loss) for the period 2,382 3,731
PT. KOMIPO Pembangkitan Jawa Bali [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 11,261 16,246
Total liabilities 4,769 4,549
Sales 20,956 21,632
Profit (loss) for the period 4,666 8,989
PT. Cirebon Power Service [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 2,808 3,456
Total liabilities 155 1,228
Sales 7,439 7,463
Profit (loss) for the period 592 301
KOWEPO International Corporation [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total liabilities 8  
Profit (loss) for the period (2)  
KOSPO Jordan [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 24,077 11,524
Total liabilities 13,594 687
Sales 7,331 7,321
Profit (loss) for the period 953 317
EWP Philippines Corporation [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,708 1,966
Total liabilities 836 955
Profit (loss) for the period (17) (41)
EWP America [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 79,854 [1] 104,809 [2]
Total liabilities 67,308 [1] 80,252 [2]
Sales 23,543 [1] 33,616 [2]
Profit (loss) for the period (9,737) [1] (8,704) [2]
KNF Canada Energy Limited [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,884 1,967
Total liabilities 31 20
Profit (loss) for the period (43) (46)
PT KEPCO Resource Indonesia [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 491 913
Total liabilities   18
Profit (loss) for the period (311) (341)
EWP Barbados 1 SRL [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 235,096 267,859
Total liabilities 450 425
Sales   1,656
Profit (loss) for the period (2,585) (902)
Gyeonggi Green Energy [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 282,408 301,126
Total liabilities 199,160 221,078
Sales 95,192 108,557
Profit (loss) for the period 3,203 19,211
PT. Tanggamus Electric Power [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 179,317 184,861
Total liabilities 160,144 167,641
Sales 34,281 40,903
Profit (loss) for the period 4,640 2,041
Gyeongju Wind Power [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 112,279 76,569
Total liabilities 82,124 49,293
Sales 7,219 6,413
Profit (loss) for the period 2,400 1,269
KOMIPO America [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 10,505 11,518
Total liabilities 521 2,432
Profit (loss) for the period 2,071 (2,240)
KOSEP USA INC. [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 184 159
Total liabilities 9,065 39,028
Sales   3,791
Profit (loss) for the period 26,997 (72,817)
PT. EWP Indonesia [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 2,035 2,154
Total liabilities 23 50
Profit (loss) for the period 1,916 1,088
KEPCO Netherlands J3 B.V. [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 122,612 125,337
Total liabilities 76 68
Profit (loss) for the period 12,115 12,433
Korea Offshore Wind Power [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 190,195 37,826
Total liabilities 1,985 2,048
Profit (loss) for the period (6,997) (4,960)
Global One Pioneer B.V. [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 151 161
Total liabilities 38 22
Profit (loss) for the period (80) (54)
Global Energy Pioneer B.V. [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 309 338
Total liabilities 41 22
Profit (loss) for the period (87) (59)
Mira Power Limited [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 208,150 178,141
Total liabilities 163,198 133,730
Profit (loss) for the period 737 (954)
KOSEP Material [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 2,751 2,398
Total liabilities 1,448 1,497
Sales 3,128 3,232
Profit (loss) for the period 320 (901)
Commerce and Industry Energy [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 99,129 99,432
Total liabilities 87,926 87,316
Sales 30,577 28,375
Profit (loss) for the period (749) (536)
KEPCO Singapore Holdings Pte. [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 3,265 2,568
Total liabilities 4 13
Profit (loss) for the period (24) (33)
KOWEPO India Private Limited [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 781 879
Profit (loss) for the period (46) 1
KEPCO KPS Philippines Corp. [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 6,636 7,897
Total liabilities 235 1,213
Sales 6,840 12,843
Profit (loss) for the period 555 2,060
KOSPO Chile SpA [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 133,570 6,656
Total liabilities 50,109 4,787
Profit (loss) for the period 1,066 125
PT. KOWEPO Sumsel Operation and Maintenance Services [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 1,350 1,439
Total liabilities 279 700
Sales 7,651 6,165
Profit (loss) for the period 659 (96)
HeeMang Sunlight Power [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 6,876 7,102
Total liabilities 3,395 3,391
Sales 105 12
Profit (loss) for the period (229) (308)
Fujeij Wind Power Company [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 165,636 47,935
Total liabilities 156,099 46,636
Profit (loss) for the period 8,836 (873)
KOSPO Youngnam Power [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 412,785 284,368
Total liabilities 333,302 205,680
Sales 68,973  
Profit (loss) for the period 939 (931)
HI Carbon Professional Private Special Asset Investment Trust 1 [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 3,002 3,002
Profit (loss) for the period 12 9
Chitose Solar Power Plant [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 136,098 49,728
Total liabilities 121,622 38,806
Sales 7,083  
Profit (loss) for the period 4,100 (811)
KEPCO Energy Solution [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 313,401 299,933
Total liabilities 12,376 233
Sales 5,544  
Profit (loss) for the period 1,325 (300)
Solar School Plant [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 201,482 200,268
Total liabilities 599 259
Sales 67 1
Profit (loss) for the period 874 9
KOSPO Power Services Limitada [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 3,901 4,385
Total liabilities 887 1,262
Sales 11,067 7,300
Profit (loss) for the period 666 2,963
Energy New Industry Specialized Investment Private Investment Trust [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 506,207 [3] 501,275
Total liabilities 2,118 [3] 33
Profit (loss) for the period 52 [3] (7)
KOEN Bylong [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5,875 6,135
KOMIPO Bylong [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5,875 6,135
KOWEPO Bylong [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5,875 6,135
KOSPO Bylong [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5,875 6,135
EWP Bylong [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 5,875 6,135
KOWEPO Lao International [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 3,259 218
Total liabilities 1,452 181
Sales 3,624  
Profit (loss) for the period 1,881 ₩ (108)
KEPCO US [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 16,913  
KEPCO Alamosa [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 33,144  
Total liabilities 492  
Profit (loss) for the period (218)  
Cogentrix Solar Services [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets [4] 84,458  
Total liabilities [4] 53,116  
Sales [4] 8,958  
Profit (loss) for the period [4] (112)  
KEPCO-LG CNS Mangilao Holdings [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 24,131  
Total liabilities 24,395  
Profit (loss) for the period (278)  
Mangilao Investment [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 24,131  
KEPCO-LG CNS Mangilao Solar [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 24,002  
Total liabilities 134  
Profit (loss) for the period (278)  
Jeju Hanlim Offshore Wind Co [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 36  
PT. Siborpa Eco Power [Member]    
Disclosure - Summary of financial information of consolidated subsidiaries [Line Items]    
Total assets 11,562  
Total liabilities 214  
Profit (loss) for the period ₩ (518)  
[1] Financial information of EWP America Inc. includes that of six other subsidiaries, EWP Renewable Corporation, DG Fairhaven Power, LLC, DG Whitefield, LLC, Springfield Power, LLC, California Power Holdings, LLC, and EWPRC Biomass Holdings, LLC.
[2] Financial information of EWP America Inc. includes that of six other subsidiaries, EWP Renewable Co., DG Fairhaven Power, LLC, DG Whitefield, LLC, Springfield Power, LLC, California Power Holdings, LLC, and EWPRC Biomass Holdings, LLC.
[3] Financial information of Energy New Industry Specialized Investment Private Investment Trust includes that of three other subsidiaries, BSK E-New Industry Fund VII, e-New Industry LB Fund 1 and Songhyun e-New Industry Fund.
[4] Financial information of Cogentrix Solar Services, LLC includes that of two other subsidiaries, Solar Investments I, LLC and Cogentrix of Alamosa, LLC.