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Investments in Joint Ventures (Parenthetical) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of joint ventures [line items]    
Acquisition cost ₩ 2,332,579 ₩ 2,069,491
Waterbury Lake Uranium L.P.    
Disclosure of joint ventures [line items]    
Acquisition cost 26,602 [1] 26,602
Nawah Energy Company    
Disclosure of joint ventures [line items]    
Acquisition cost [2] ₩ 296 ₩ 296
PungBack Wind Farm Corporation    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 37.00%  
Acquisition cost [3] ₩ 7,885  
Trumbull Asset Management, LLC    
Disclosure of joint ventures [line items]    
Acquisition cost [4] 0  
Pyeongchang Wind Power Co., Ltd    
Disclosure of joint ventures [line items]    
Acquisition cost [5] 9,329  
Seobusambo highway photovoltaics Co., Ltd.    
Disclosure of joint ventures [line items]    
Acquisition cost [6] ₩ 3,020  
UD4M Co., Ltd.    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 14.29% 12.50%
Percentage of ownership interest including holding in treasury stock 14.29%  
Saemangeum Sebit Power Plant Co., Ltd. [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 63.09% 69.55%
Environment and Energy Co., Ltd    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 10.54%  
Korea Gas Corporation    
Disclosure of joint ventures [line items]    
Effective percentage of ownership   20.47%
Acquisition cost ₩ 2,085,296 ₩ 1,815,513
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]    
Effective percentage of ownership 25.54%  
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%
Indeck Niles Development, LLC [Member]    
Disclosure of joint ventures [line items]    
Additional percentage of ownership associate   50.00%
Daegu Green Power Joint Ventures [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 54.24% 54.24%
Nominal percentage of ownership associate 29.00% 29.00%
Saemangeum Solar Power Co., Ltd [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership   50.00%
Hyundai Energy [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 46.30% 46.30%
Additional percentage of ownership associate 15.64% 15.64%
Bottom of range [member] | Pulau Indah O&M Sdn. Bhd    
Disclosure of joint ventures [line items]    
Effective percentage of ownership in joint venture 50.00% 50.00%
Bottom of range [member] | Trumbull Asset Management, LLC    
Disclosure of joint ventures [line items]    
Effective percentage of ownership in joint venture 50.00%  
Bottom of range [member] | Pyeongchang Wind Power Co., Ltd    
Disclosure of joint ventures [line items]    
Effective percentage of ownership in joint venture 50.00%  
Bottom of range [member] | Taebaek Guinemi Wind Power Co., Ltd    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 50.00%  
Bottom of range [member] | Seobusambo highway photovoltaics Co., Ltd.    
Disclosure of joint ventures [line items]    
Effective percentage of ownership in joint venture 50.00%  
Bottom of range [member] | Saemangeum Sebit Power Plant Co., Ltd. [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 50.00%  
Bottom of range [member] | Gangwon Wind Power Co., Ltd. [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership   20.00%
Bottom of range [member] | KNOC Nigerian East Oil [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership   20.00%
Bottom of range [member] | Samcheok Eco Materials Co., Ltd. [Member]    
Disclosure of joint ventures [line items]    
Nominal percentage of ownership associate   2.35%
Bottom of range [member] | Korea Electric Power Corporation Fund [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 50.00%  
Bottom of range [member] | Namjeongsusang Solar Power Operation Co., Ltd. [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership   20.00%
Bottom of range [member] | Shuweihat Asia Operation & Maintenance Company [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership in joint venture 50.00%  
Bottom of range [member] | Saemangeum Solar Power Co., Ltd [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership in joint venture 50.00%  
Bottom of range [member] | SUNMEX RENOVABLES, S.A. DE C.V. [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership   20.00%
Bottom of range [member] | Nepal Water Energy Development Company Private Limited [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 50.00%  
Top of range [member] | Waterbury Lake Uranium L.P.    
Disclosure of joint ventures [line items]    
Effective percentage of ownership in joint venture 50.00%  
Top of range [member] | Nawah Energy Company    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 20.00%  
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%  
Top of range [member] | Gangwon Wind Power Co., Ltd. [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 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] | Korea Electric Power Corporation Fund [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership   50.00%
Top of range [member] | Namjeongsusang Solar Power Operation Co., Ltd. [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 20.00%  
Top of range [member] | Shuweihat Asia Operation & Maintenance Company [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership   50.00%
Top of range [member] | Saemangeum Solar Power Co., Ltd [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership   50.00%
Top of range [member] | SUNMEX RENOVABLES, S.A. DE C.V. [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership 20.00%  
Top of range [member] | Nepal Water Energy Development Company Private Limited [Member]    
Disclosure of joint ventures [line items]    
Effective percentage of ownership   50.00%
Top of range [member] | Barakah One Company [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 effective percentage of ownership is less than 50%. However, the entity is classified as a joint venture, because all consent was required to make decisions on related activities.
[2] The effective percentage of ownership is less than 20%. However, decisions in relevant actitvities must be agreed by ownership parties. Accordingly, the entity is classified as joint ventures.
[3] The effective percentage of ownership is 37%, considering potential common stock.
[4] The effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all members of the board of directors. Accordingly, the entity is classified as a joint venture.
[5] After addtional acquisition of the shares, the effective percentage of ownership is more than 50%. However, decisions in relevant actitvities must be agreed by all members of the board of directors. Accordingly, the entity is classified as a joint venture.
[6] Due to the changes in the agreement, the Group lost its control over the entity. Accordingly, the entity is reclassified to a joint venture from a subsidiary. Although the effective percentage of ownership is more than 50%, decisions in relevant actitvities must be agreed by all members of the board of directors.