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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.

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