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Commitments for Expenditure (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Purchase of switch (25.8kV Eco) 11,395 [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts ₩ 40,226 ₩ 40,226
Commitments for Expenditure balance   28,072
Purchase of switch (25.8kV Eco) 12,450 [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 50,526  
Commitments for Expenditure balance 35,494  
Purchase of cable (PVC,1C,2000SQ) 153,000M and others (Shin-Bupyung-Youngseo) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 50,256 50,256
Commitments for Expenditure balance 42,857 50,256
Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shintangjung) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 42,500 42,500
Commitments for Expenditure balance 29,987 42,500
Purchase of GIS (362KV 6300A 63KA) 23CB – YoungseoS/S [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 34,500  
Commitments for Expenditure balance 34,500  
Purchase of GIS (362KV 6300A 63KA) 26CB – Shin-gosungS/S [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 36,950 36,950
Commitments for Expenditure balance   19,897
Purchase of GIS (362KV 6300A 63KA) 26CB – HwasungS/S [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 40,000  
Commitments for Expenditure balance 29,231  
Purchase of GIS (362KV 6300A 63KA) 27CB – KwangyangS/S [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 37,476 37,476
Commitments for Expenditure balance 18,044 27,760
Purchase of GIS (362KV 6300A 63KA) and 1 other 18CB – BukbusanS/S [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 34,000 34,000
Commitments for Expenditure balance   20,766
Purchase of GIS (800KV 8000A 50KA) 10CB – Shin-JungbuS/S [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 63,730 63,730
Commitments for Expenditure balance 44,955 63,730
Purchase of transformer (765/345/23kV 666.7MVA, 2TANK) 6 units – Shin-JungbuS/S [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 37,500 37,500
Commitments for Expenditure balance 37,500 37,500
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 4,500,000M [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 71,986 71,986
Commitments for Expenditure balance   50,593
Purchase of Concrete Poles (10M, 350KGF) 104,755 and 6 others [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 129,175 129,175
Commitments for Expenditure balance   105,905
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 4,645,000M [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 78,076  
Commitments for Expenditure balance 76,762  
Purchase of Concrete Poles (10M, 350KGF) 121,900 and 6 others [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 133,387  
Commitments for Expenditure balance 112,981  
Advanced E-Type low voltage electricity meter 1,600,000 units [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 65,408  
Commitments for Expenditure balance 64,592  
Purchase of Ground Switch (44-D-A125, 600AX4) and 1 other 4,016 units [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 56,482  
Commitments for Expenditure balance 55,990  
Construction of Shin-Kori units (#3,4) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 7,363,514 6,856,150
Commitments for Expenditure balance 93,637  
Construction of Shin-Kori units (#5,6) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 8,625,387 8,625,387
Commitments for Expenditure balance 6,757,146 7,286,503
Construction of Shin-Hanwool units (#1,2) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 7,982,342 7,982,342
Commitments for Expenditure balance 1,015,813 1,157,700
Construction of Shin-Hanwool units (#3,4) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 8,261,818 8,261,818
Commitments for Expenditure balance 8,097,056 8,170,896
Construction of Yeosu thermal power units (#1) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 174,291 174,291
Commitments for Expenditure balance   1,139
Other 27 contracts [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 262,400 430,204
Commitments for Expenditure balance 114,041 222,555
Purchase of main machine for construction of Seoul Combined units (#1,2) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 361,203 360,500
Commitments for Expenditure balance 99,031 300,663
Construction of Seoul Combined units (#1,2) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 227,685 225,205
Commitments for Expenditure balance 60,568 129,589
Electricity construction of Shin-Boryeong units (#1,2) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 379,115 354,740
Commitments for Expenditure balance   26,878
Purchase of smoke eliminating machine for construction of Shin-Boryeong units (#1,2) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 169,544 121,093
Commitments for Expenditure balance 36,417 2,023
Purchase of coal handling machine for construction of Shin-Boryeong units (#1,2) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 146,353 146,353
Commitments for Expenditure balance   3,543
Service of designing Shin-Boryeong units (#1,2) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 127,810 126,038
Commitments for Expenditure balance 16,371 24,333
Purchase of main machine for construction of Shin-Boryeong units (#1,2) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 866,065 851,132
Commitments for Expenditure balance 4,981 10,746
Construction of Shin-Boryeong units (#1,2) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 316,190 288,438
Commitments for Expenditure balance 23,100 17,828
Purchase of furnace for construction of Shin-Seocheon thermal power plant [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 302,030  
Commitments for Expenditure balance 222,555  
Purchase of turbine generator for construction of Shin-Seocheon thermal power plant [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 104,402  
Commitments for Expenditure balance 83,522  
Electricity construction of Shin-Seocheon thermal power plant [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 200,453  
Commitments for Expenditure balance 196,993  
Purchase of main machine for Jeju LNG combined [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 166,287  
Commitments for Expenditure balance 15,409  
Purchase of coal handling machine for construction of Taean (#9,10) and IGCC units (conditional contract for installation) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 193,375 192,945
Commitments for Expenditure balance 5,129 38,218
Purchase of furnace for construction of Taean units (#9,10) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 566,945 584,148
Commitments for Expenditure balance 33,817 46,059
Service of designing Taean units (#9,10) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 111,322 109,700
Commitments for Expenditure balance 13,671 18,981
Purchase of desulfurization machine for construction of Taean units (#9,10) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts   92,086
Commitments for Expenditure balance   1,017
Purchase of turbine generator for construction of Taean units (#9,10) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 205,267 228,794
Commitments for Expenditure balance 550 6,788
Purchase of combined generating machine for construction of Taean IGCC units [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 190,923 208,972
Commitments for Expenditure balance   2,102
Purchase of oxygen plant for construction of Taean IGCC units [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 94,564 98,979
Commitments for Expenditure balance 199 221
Service of designing Taean IGCC plant units [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 44,802 44,802
Commitments for Expenditure balance 2,669 3,342
Purchase of gasification plant for construction of Taean IGCC units [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 456,037 457,991
Construction of Samcheok units (#1,2) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 488,347 457,943
Commitments for Expenditure balance   15,851
Purchase of furnace for construction of Samcheok units (#1,2) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 1,082,641 1,091,303
Commitments for Expenditure balance 5,963 51,594
Purchase of coal handling machine for construction of Samcheok units (#1,2) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 304,924 303,273
Commitments for Expenditure balance 52,362 155
Service of designing Samcheok units (#1,2) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 114,047 114,047
Commitments for Expenditure balance 4,745 36,510
Purchase of main equipment [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 168,076 152,286
Commitments for Expenditure balance   39,248
Landscaping construction and other [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 63,110  
Construction of yard for Andong natural gas power plant [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 41,961 41,961
Commitments for Expenditure balance   2,600
Purchase of turbine main equipment for Samcheok units (#1,2) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 215,333  
Commitments for Expenditure balance 874  
Service of designing Dangjin units (#9,10) [Member]    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts ₩ 122,426 122,426
Commitments for Expenditure balance   ₩ 6,125