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Consolidated Subsidiaries - Summary of Consolidated Subsidiaries (Parentheticals) (Details)
 12 Months Ended
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.