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Investments in Associates (Parenthetical) (Details)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of joint ventures [line items]    
Effective percentage of ownership 20.00%  
UD4M Co., Ltd.    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 14.29% [1] 14.29% [2]
Percentage of ownership interest including holding in treasury stock 14.29% 14.29%
Saemangeum Sebit Power Plant Co., Ltd. [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 55.00% [1] 55.00% [2]
Environment and Energy Co., Ltd    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 10.54% [1] 10.54% [2]
Korea Gas Corporation    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 21.66%  
Korea Power Exchange [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 100.00% 100.00%
Samcheok Eco Materials Co., Ltd. [Member]    
Disclosure of joint ventures [line items]    
Nominal percentage of ownership associate   2.35%
Dongducheon Dream Power [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 34.01% 34.01%
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% 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%
[1] The percentage of ownership shown above is an effective percentage of ownership including the treasury stocks and others.
[2] The percentage of ownership shown above is after considering the treasury stocks and others.