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Investments in Joint Ventures (Parenthetical) (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Disclosure of joint ventures [line items] |  |
Acquisition cost | ₩ 2,069,491 | ₩ 1,943,392
Korea Gas Corporation |  |
Disclosure of joint ventures [line items] |  |
Effective percentage of ownership | 20.47% | 22.02%
Acquisition cost | ₩ 1,815,513 | ₩ 1,647,325
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% | 50.00%
Daegu Green Power Joint Ventures [Member] |  |
Disclosure of joint ventures [line items] |  |
Effective percentage of ownership | 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] | Gangwon Wind Power Co., Ltd. [Member] |  |
Disclosure of joint ventures [line items] |  |
Effective percentage of ownership | 20.00% | 20.00%
Bottom of range [member] | KNOC Nigerian East Oil [Member] |  |
Disclosure of joint ventures [line items] |  |
Effective percentage of ownership | 20.00% | 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] | Namjeongsusang Solar Power Operation Co., Ltd. [Member] |  |
Disclosure of joint ventures [line items] |  |
Effective percentage of ownership | 20.00% | 20.00%
Bottom of range [member] | Go Deok Clean Energy Co., Ltd. [Member] |  |
Disclosure of joint ventures [line items] |  |
Effective percentage of ownership |  | 50.00%
Bottom of range [member] | Jeju SolarOne Co., Ltd.( [Member] |  |
Disclosure of joint ventures [line items] |  |
Effective percentage of ownership |  | 20.00%
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] | Seoroseoro Sunny Power Plant Co Ltd [Member] |  |
Disclosure of joint ventures [line items] |  |
Effective percentage of ownership |  | 20.00%
Bottom of range [member] | Barakah One Company [Member] |  |
Disclosure of joint ventures [line items] |  |
Effective percentage of ownership | 20.00% |
Bottom of range [member] | Horus Solar S.A. De C.V. [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% | 50.00%
Top of range [member] | Go Deok Clean Energy Co., Ltd. [Member] |  |
Disclosure of joint ventures [line items] |  |
Effective percentage of ownership |  | 50.00%
Top of range [member] | Shuweihat Asia Operation & Maintenance Company [Member] |  |
Disclosure of joint ventures [line items] |  |
Effective percentage of ownership | 50.00% | 50.00%
Top of range [member] | Saemangeum Solar Power Co., Ltd [Member] |  |
Disclosure of joint ventures [line items] |  |
Effective percentage of ownership | 50.00% | 50.00%
Top of range [member] | Nepal Water Energy Development Company Private Limited [Member] |  |
Disclosure of joint ventures [line items] |  |
Effective percentage of ownership | 50.00% | 50.00%
Top of range [member] | Barakah One Company [Member] |  |
Disclosure of joint ventures [line items] |  |
Effective percentage of ownership |  | 20.00%

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