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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.

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