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Commitments for Expenditure (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Purchase of switch (25.8kV Eco) 12,450    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts ₩ 50,526 ₩ 50,526
Commitments for Expenditure balance 0 35,494
Purchase of cable (PVC,1C,2000SQ) 153,000M and others (Shin-Bupyung-Youngseo)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 56,183 50,256
Commitments for Expenditure balance 37,309 42,857
Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shintangjung)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 44,315 42,500
Commitments for Expenditure balance 31,801 29,987
Purchase of GIS (362KV 6300A 63KA) 23CB - YoungseoS/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 34,500 34,500
Commitments for Expenditure balance 34,500 34,500
Purchase of GIS (362KV 6300A 63KA) 27CB - KwangyangS/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 37,694 37,476
Commitments for Expenditure balance 10,491 18,044
Purchase of GIS (800KV 8000A 50KA) 10CB - Shin-JungbuS/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 63,730 63,730
Commitments for Expenditure balance 0 44,955
Purchase of transformer (765/345/23kV 666.7MVA, 2TANK) 6 units - Shin-JungbuS/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 37,500 37,500
Commitments for Expenditure balance 0 37,500
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 4,645,000M    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 78,076 78,076
Commitments for Expenditure balance 0 76,762
Purchase of Concrete Poles (10M, 350KGF) 121,900 and 6 others    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 133,387 133,387
Commitments for Expenditure balance 13,343 112,981
Advanced E-Type low voltage electricity meter 1,600,000 units    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 65,408 65,408
Commitments for Expenditure balance 0 64,592
Purchase of Ground Switch (44-D-A125, 600AX4) and 1 other 4,016 units    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 56,482 56,482
Commitments for Expenditure balance 0 55,990
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 0
Commitments for Expenditure balance 38,998 0
Purchase of cable (FR CNCO-W,1C,325SQ) 1,400,000    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 57,475 0
Commitments for Expenditure balance 48,598 0
Purchase of switch (Eco) 9,360 units    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 40,631 0
Commitments for Expenditure balance 34,797 0
Construction of Shin-Kori units (#3,4)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 7,363,514 7,363,514
Commitments for Expenditure balance 3,211 93,637
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 5,930,099 6,757,146
Construction of Shin-Hanul units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 7,982,342 7,982,342
Commitments for Expenditure balance 355,704 1,015,813
Construction of Shin-Hanul units (#3,4)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts [1] 0 8,261,818
Commitments for Expenditure balance [1] 0 8,097,056
Other 27 contracts    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 269,681 262,400
Commitments for Expenditure balance 161,243 114,041
Purchase of main machine for construction of Seoul Combined units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 365,164 361,203
Commitments for Expenditure balance 51,165 99,031
Construction of Seoul Combined units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 285,890 227,685
Commitments for Expenditure balance 27,125 60,568
Purchase of smoke eliminating machine for construction of Shin-Boryeong units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 172,609 169,544
Commitments for Expenditure balance 13,986 36,417
Service of designing Shin-Boryeong units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 120,199 127,810
Commitments for Expenditure balance 1,076 16,371
Purchase of main machine for construction of Shin-Boryeong units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 866,065 866,065
Commitments for Expenditure balance 4,981 4,981
Construction of Shin-Boryeong units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 309,466 316,190
Commitments for Expenditure balance 0 23,100
Purchase of furnace for construction of Shin-Seocheon thermal power plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 305,209 302,030
Commitments for Expenditure balance 74,631 222,555
Purchase of turbine generator for construction of Shin-Seocheon thermal power plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 104,402 104,402
Commitments for Expenditure balance 57,968 83,522
Electricity construction of Shin-Seocheon thermal power plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 217,848 200,453
Commitments for Expenditure balance 174,122 196,993
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 11,272 15,409
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 205,764 193,375
Commitments for Expenditure balance 282 5,129
Purchase of furnace for construction of Taean units (#9,10)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 556,504 566,945
Commitments for Expenditure balance 18,502 33,817
Service of designing Taean units (#9,10)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 112,344 111,322
Commitments for Expenditure balance 13,338 13,671
Purchase of turbine generator for construction of Taean units (#9,10)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 214,462 205,267
Commitments for Expenditure balance 10,422 550
Purchase of oxygen plant for construction of Taean IGCC units    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 96,068 94,564
Commitments for Expenditure balance 1,552 199
Service of designing Taean IGCC plant units    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 46,001 44,802
Commitments for Expenditure balance 3,161 2,669
Purchase of furnace for construction of Samcheok units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 1,092,287 1,082,641
Commitments for Expenditure balance 12,215 5,963
Purchase of coal handling machine for construction of Samcheok units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 307,925 304,924
Commitments for Expenditure balance 48,736 52,362
Service of designing Samcheok units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 103,679 114,047
Commitments for Expenditure balance 0 4,745
Purchase of turbine main equipment for Samcheok units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 212,188 215,333
Commitments for Expenditure balance 348 874
Purchase of main equipment for Namjeju    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 146,594 0
Commitments for Expenditure balance ₩ 134,949 ₩ 0
[1] The Company recognized impairment loss in relation to Shin-Hanul unit 3 and 4, and there are no legally binding commitments for expenditure as of December 31, 2018.