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Commitments for Expenditure - Summary of Commitments For Acquisition of Property, Plant and Equipment (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2021
Dec. 31, 2020
Purchase of cable (PVC,1C,2000SQ) 153,000M and others (Shin-Bupyung-Youngseo)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts ₩ 57,046 ₩ 56,574
Commitments for Expenditure Remaining liability balances 16,240 16,038
Purchase of cable (PVC, 1C, 2500SQ) 103,374M and others (Bukdangjin-Shintangjung)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 46,616 45,390
Commitments for Expenditure Remaining liability balances 34,102 32,876
Purchase of GIS (362KV 6300A 63KA) 23CB - YoungseoS/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 36,143 36,143
Commitments for Expenditure Remaining liability balances 25,292 29,898
Purchase of GIS (362kV, 6300A, 63kA) 26CB - Hwasung S/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 40,010 40,010
Commitments for Expenditure Remaining liability balances 5,540 8,328
Purchase of GIS (362KV 6300A 63KA) 27CB - KwangyangS/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 37,744 37,744
Commitments for Expenditure Remaining liability balances 140 2,244
Purchase of cable (FR CNCO-W,1C,325SQ) 1,400,000    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 0 59,716
Commitments for Expenditure Remaining liability balances 0 37,249
Purchase of switch (Eco) 9,360 units    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 0 40,631
Commitments for Expenditure Remaining liability balances 0 24,031
Purchase of cable (TR CNCE-W,1C,600SQ) 551,200M    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 0 37,288
Commitments for Expenditure Remaining liability balances 0 23,100
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 4,464,000M    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 0 82,622
Commitments for Expenditure Remaining liability balances 0 51,130
Purchase of cable (FR CNCO-W,1C,325SQ) 1,092,000M    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 0 42,068
Commitments for Expenditure Remaining liability balances 0 35,358
Concrete pole (10M, general purpose, 350KGF) 102,435 ea and five other equipments    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 0 91,889
Commitments for Expenditure Remaining liability balances 0 80,904
Purchase of cable (PVC, 1C, 2500SQ) 100,548M and others    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 56,860 0
Commitments for Expenditure Remaining liability balances 34,576 0
Purchase of GIS (362kV, 6300A, 63kA) 25CB – Migeum S/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 32,000 0
Commitments for Expenditure Remaining liability balances 26,700 0
Advanced E-Type low-pressure electronic power meter 1,320,000 ea    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 65,972 0
Commitments for Expenditure Remaining liability balances 23,262 0
Purchase of cable (PVC, 1C, 2000SQ) 5,862M and others (Baekun-Gwangyanghang)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 34,423 0
Commitments for Expenditure Remaining liability balances 23,297 0
Purchase of cable (TR CNCE- W,1C,325SQ) 1,016,000M    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 66,581 0
Commitments for Expenditure Remaining liability balances 40,254 0
Purchase of cable (TR CNCE-W,1C,600SQ) 485,000M    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 46,194 0
Commitments for Expenditure Remaining liability balances 37,810 0
Purchase of cable (TR CNCE-W/AL,1C,400SQ) 3,303,900M    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 87,382 0
Commitments for Expenditure Remaining liability balances 83,628 0
Concrete pole (10M, general purpose, 350KGF) 126,948 ea and five other equipments    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 188,338 0
Commitments for Expenditure Remaining liability balances 168,456 0
Purchase of GIS (362KV, 6300A, 63KA) 25 – Shinyangsan S/S    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 31,464  
Commitments for Expenditure Remaining liability balances 31,464  
Construction of Shin-Kori Units (#5,6)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 9,800,424 8,625,387
Commitments for Expenditure Remaining liability balances 3,479,667 3,256,117
Construction of Shin-Hanul Units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 9,745,123 9,443,635
Commitments for Expenditure Remaining liability balances 0 160,512
Other 30 contracts    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 792,485 107,586
Commitments for Expenditure Remaining liability balances 620,593 58,466
Service of designing Seoul Combined Units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 31,841 31,841
Commitments for Expenditure Remaining liability balances 934 984
Service of designing Shin-Boryeong Units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 121,114 121,163
Commitments for Expenditure Remaining liability balances 0 521
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 Remaining liability balances 7,722 29,042
Purchase of turbine generator for construction of Shin-Seocheon Thermal Power Plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 105,226 105,226
Commitments for Expenditure Remaining liability balances 6,301 8,279
Electricity construction of Shin-Seocheon Thermal Power Plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 340,356 282,234
Commitments for Expenditure Remaining liability balances 0 13,524
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 Remaining liability balances 10,972 11,182
Service of designing Taean Units (#9,10)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 112,909 112,813
Commitments for Expenditure Remaining liability balances 12,623 12,933
Purchase of gas turbines and turbine equipment of Gimpo Combined Heat & Power Plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 126,302 104,600
Commitments for Expenditure Remaining liability balances 61,735 41,840
Purchase of steam turbine, HRSG and Popwer Block of Gimpo Combined Heat & Power Plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 214,053 210,900
Commitments for Expenditure Remaining liability balances 138,244 147,630
Construction of Gimpo Combined Heat & Power Plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 130,015 0
Commitments for Expenditure Remaining liability balances 86,323 0
Purchase of coal handling machine for construction of Samcheok Units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 286,571 285,158
Commitments for Expenditure Remaining liability balances 6,215 22,751
Purchase of furnace main equipment for construction of Samcheok Units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 0 1,065,141
Commitments for Expenditure Remaining liability balances 0 11,609
Purchase of turbine main equipment for Samcheok Units (#1,2)    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 0 211,349
Commitments for Expenditure Remaining liability balances 0 125
Purchase of main equipment for Namjeju    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 140,144 140,144
Commitments for Expenditure Remaining liability balances 3 112
Purchase of main equipment for Shin-Sejong Combined Thermal Power Plant    
Disclosure of Commitments for Expenditure [Line Items]    
Commitments for Expenditure amounts 234,392 0
Commitments for Expenditure Remaining liability balances ₩ 200,122 ₩ 0