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Investments in Associates (Parenthetical) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Feb. 15, 2024
Dec. 31, 2021
Disclosure of joint ventures [line items]        
Effective percentage of ownership   20.00%    
Percentage of ownership interest including holding in treasury stock   14.29%    
Investment in associates accounted for using equity method ₩ 6,176,889 ₩ 5,844,464   ₩ 5,232,373
Taebaek Guinemi Wind Power Co., Ltd        
Disclosure of joint ventures [line items]        
Effective percentage of ownership   50.00%    
UD4M Co., Ltd.        
Disclosure of joint ventures [line items]        
Effective percentage of ownership [1] 14.29% 14.29%    
Percentage of ownership interest including holding in treasury stock 14.29%      
Investment in associates accounted for using equity method ₩ 150 ₩ 161   144
Saemangeum Sebit Power Plant Co., Ltd. [Member]        
Disclosure of joint ventures [line items]        
Effective percentage of ownership [1] 55.00% 63.09%    
Investment in associates accounted for using equity method ₩ 37,191 [2] ₩ 23,199 [3]   6,000
Environment and Energy Co., Ltd        
Disclosure of joint ventures [line items]        
Effective percentage of ownership [1] 10.54% 10.54%    
Investment in associates accounted for using equity method ₩ 9 [4] ₩ 10 [4]   ₩ 0
Korea Gas Corporation        
Disclosure of joint ventures [line items]        
Investment in associates accounted for using equity method ₩ 1,970,642 ₩ 2,085,296    
Discount rate used to estimate current value in use 4.01% 5.20%    
Korea Power Exchange [Member]        
Disclosure of joint ventures [line items]        
Effective percentage of ownership 100.00% 100.00%    
KNOC Nigerian East Oil [Member]        
Disclosure of joint ventures [line items]        
Effective percentage of ownership   20.00%    
Samcheok Eco Materials Co., Ltd. [Member]        
Disclosure of joint ventures [line items]        
Effective percentage of ownership   25.54%    
Nominal percentage of ownership associate 2.35% 2.35%    
Dongducheon Dream Power [Member]        
Disclosure of joint ventures [line items]        
Effective percentage of ownership 34.01% 34.01%    
YTN Co., Ltd. [Member]        
Disclosure of joint ventures [line items]        
Percentage Of Shares Sold     (21.43%)  
Proceeds From Sale Of Shares     ₩ 221,490  
Bottom of range [member] | Saemangeum Sebit Power Plant Co., Ltd. [Member]        
Disclosure of joint ventures [line items]        
Effective percentage of ownership 50.00% 50.00%    
Bottom of range [member] | Korea Electric Power Corporation Fund [Member]        
Disclosure of joint ventures [line items]        
Effective percentage of ownership 50.00% 50.00%    
Bottom of range [member] | Nepal Water Energy Development Company Private Limited [Member]        
Disclosure of joint ventures [line items]        
Effective percentage of ownership 50.00% 50.00%    
Top of range [member] | UD4M Co., Ltd.        
Disclosure of joint ventures [line items]        
Effective percentage of ownership 20.00%      
Top of range [member] | Environment and Energy Co., Ltd        
Disclosure of joint ventures [line items]        
Effective percentage of ownership 20.00% 20.00%    
Top of range [member] | Gangwon Wind Power Co., Ltd. [Member]        
Disclosure of joint ventures [line items]        
Effective percentage of ownership 20.00% 20.00%    
Top of range [member] | KNOC Nigerian East Oil [Member]        
Disclosure of joint ventures [line items]        
Effective percentage of ownership 20.00%      
Top of range [member] | Samcheok Eco Materials Co., Ltd. [Member]        
Disclosure of joint ventures [line items]        
Effective percentage of ownership 25.54%      
Top of range [member] | Namjeongsusang Solar Power Operation Co., Ltd. [Member]        
Disclosure of joint ventures [line items]        
Effective percentage of ownership 20.00% 20.00%    
Top of range [member] | Yeomsubong Wind Power Co., Ltd        
Disclosure of joint ventures [line items]        
Effective percentage of ownership   20.00%    
[1] The percentage of ownership shown above is after considering the treasury stocks and others.
[2] The effective percentage of ownership decreased due to the disproportionate paid-in capital increase during the year ended December 31, 2023. The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.
[3] The effective percentage of ownership decreased due to the disproportionate paid-in capital increase during the year ended December 31, 2022. The effective percentage of ownership is more than 50% but the Company does not hold control over relevant business while it exercises significant influence by participating in the Investment Decision Committee. Accordingly, the entity is classified as an associate.
[4] The effective percentage of ownership is less than 20%. However, the entity is classified as an associate because the Company exercises significant influence over the entity.