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Commitments for Expenditure (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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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.

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