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Commitments for Expenditure (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Purchase of cable (PVC,1C,2000SQ) 153,000M and others (Shin-Bupyung-Youngseo)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts ₩ 56,408 ₩ 56,183
Commitments for Expenditure balance 24,721 37,309
Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shintangjung)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 45,390 44,315
Commitments for Expenditure balance 32,876 31,801
Purchase of GIS (362KV 6300A 63KA) 23CB - YoungseoS/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 36,143 34,500
Commitments for Expenditure balance 36,143 34,500
Purchase of GIS (362kV, 6300A, 63kA) 26CB - Hwasung S/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 40,010 29,143
Commitments for Expenditure balance 15,300 18,194
Purchase of GIS (362KV 6300A 63KA) 27CB - KwangyangS/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 37,744 37,694
Commitments for Expenditure balance 9,700 10,491
Purchase of Concrete Poles (10M, 350KGF) 121,900 and 6 others    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 0 133,387
Commitments for Expenditure balance 0 13,343
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 3,504,000M    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 66,240 66,240
Commitments for Expenditure balance 0 38,998
Purchase of cable (FR CNCO-W,1C,325SQ) 1,400,000    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 59,716 57,475
Commitments for Expenditure balance 37,249 48,598
Purchase of switch (Eco) 9,360 units    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 40,631 40,631
Commitments for Expenditure balance 24,031 34,797
Purchase of cable (TR CNCE-W/AL, 1C, 400SQ) 2,654,400M    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 36,063 0
Commitments for Expenditure balance 6,243 0
Construction of Shin-Kori units (#3,4)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 7,498,951 7,363,514
Commitments for Expenditure balance 0 3,211
Construction of Shin-Kori units (#5,6)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 8,625,387 8,625,387
Commitments for Expenditure balance 4,479,956 5,930,099
Construction of Shin-Hanul units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 8,306,149 7,982,342
Commitments for Expenditure balance 0 355,704
Other 27 contracts    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 352,710 269,681
Commitments for Expenditure balance 122,890 161,243
Service of designing Seoul Combined units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 30,778 29,996
Commitments for Expenditure balance 2,119 4,744
Purchase of main machine for construction of Seoul Combined units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 331,249 365,164
Commitments for Expenditure balance 15,918 51,165
Construction of Seoul Combined units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 387,722 285,890
Commitments for Expenditure balance 31,150 27,125
Purchase of smoke eliminating machine for construction of Shin-Boryeong units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 157,618 172,609
Commitments for Expenditure balance 0 13,986
Service of designing Shin-Boryeong units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 120,668 120,199
Commitments for Expenditure balance 888 1,076
Purchase of main machine for construction of Shin-Boryeong units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 816,317 866,065
Commitments for Expenditure balance 4,955 4,981
Purchase of furnace for construction of Shin-Seocheon thermal power plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 305,209 305,209
Commitments for Expenditure balance 43,388 74,631
Purchase of turbine generator for construction of Shin-Seocheon thermal power plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 105,226 104,402
Commitments for Expenditure balance 10,736 57,968
Electricity construction of Shin-Seocheon thermal power plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 231,196 217,848
Commitments for Expenditure balance 87,874 174,122
Purchase of main machine for Jeju LNG combined    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 166,287 166,287
Commitments for Expenditure balance 12,088 11,272
Purchase of coal handling machine for construction of Taean (#9,10) and IGCC units (conditional contract for installation)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 205,764 205,764
Commitments for Expenditure balance 282 282
Purchase of furnace for construction of Taean units (#9,10)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 556,206 556,504
Commitments for Expenditure balance 17,579 18,502
Service of designing Taean units (#9,10)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 112,483 112,344
Commitments for Expenditure balance 12,862 13,338
Purchase of turbine generator for construction of Taean units (#9,10)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 214,208 214,462
Commitments for Expenditure balance 10,857 10,422
Purchase of oxygen plant for construction of Taean IGCC units    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 97,345 96,068
Commitments for Expenditure balance 1,630 1,552
Purchase of gas turbine and turbine equipment of Gimpo combined heat & power plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 104,600 0
Commitments for Expenditure balance 104,600 0
Service of designing Taean IGCC plant units    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 46,101 46,001
Commitments for Expenditure balance 2,332 3,161
Purchase of furnace for construction of Samcheok units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 1,066,824 1,092,287
Commitments for Expenditure balance 11,771 12,215
Purchase of coal handling machine for construction of Samcheok units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 282,927 307,925
Commitments for Expenditure balance 42,785 48,736
Purchase of turbine main equipment for Samcheok units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 223,550 212,188
Commitments for Expenditure balance 132 348
Purchase of main equipment for Namjeju    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 138,486 146,594
Commitments for Expenditure balance ₩ 84,982 ₩ 134,949