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Property, Plant and Equipment - Summary of Changes in Preperty, Plant and Equipment (Details) (Parenthetical) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about property, plant and equipment [line items]      
Impairment of property plant and equipment ₩ 17,031 ₩ 37,311 ₩ 4,056
Property plant and equipment 179,875,535 177,865,308 173,134,638
Revenue 87,476,410 70,546,024 60,012,375
Cost of sales 89,699,527 100,903,594 ₩ 63,644,290
Property, Plant and Equipment-Proceeds before Intended Use [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Revenue 38,149 94,264  
Property Plant and Equipment Costs Before Intended Use [Member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Cost of sales 45,578 63,405  
Construction in progress [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment 31,835,028 27,905,545  
Korea Western Power Co., Ltd. [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Revenue 6,915,233 8,112,727  
Korea Western Power Co., Ltd. [member] | Taean IGCC Gas Refinery [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Impairment of property plant and equipment 6,331    
Guam Ukudu Power LLC [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Revenue 0 ₩ 0  
Guam Ukudu Power LLC [member] | Construction in progress [member]      
Disclosure of detailed information about property, plant and equipment [line items]      
Property plant and equipment ₩ 10,700