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Consolidated Subsidiaries - Summary of Consolidated Subsidiaries (Parentheticals) (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
KEPCO Engineering & Construction Company, Inc. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership percentage | [1] | 65.77% | 65.77%
Percentage of Effective Percentage Ownership Holding In Subsidiary |  | 66.08% |
PT. Cirebon Power Service |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership percentage | [2] | 27.50% | 27.50%
Description of Reason for Subsidiary Included in in the Consolidated Financial Statements |  | 50.00% |
KOSPO Youngnam Power Co., Ltd. |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership percentage | [3] | 50.00% | 50.00%
Elara Investment Holdings, LLC |  |  |
Disclosure of subsidiaries [line items] |  |  |
Proportion of ownership percentage | [4] | 0.10% | 0.00%
Description of Reason for Subsidiary Included in in the Consolidated Financial Statements |  | 50.00% |
[1] | Considering treasury stocks, the effective percentage of ownership is 66.08%.
[2] | The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company obtained the majority of the voting power under the shareholders’ agreement.
[3] | The subsidiary is included in the consolidated financial statements as the Company owns 50%+1 stake and has the ability to appoint a majority of the board members under the the shareholders’ agreement.
[4] | The effective percentage of ownership is less than 50%. However, this consolidated subsidiary is included in the consolidated financial statements as the Company has control over the board of directors under the shareholders’ agreement.

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