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Investments in Associates and Joint Ventures - Additional Information (Details)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Time Period One [Member] | Daegu Green Power Co., Ltd.    
Disclosure Of Investments in Associates and Joint Ventures [Line Items]    
Duration from the date of investment after which the rights to purchase the shares may be exercised 5 years  
Time Period Two [Member] | Daegu Green Power Co., Ltd.    
Disclosure Of Investments in Associates and Joint Ventures [Line Items]    
Duration from the date of investment after which the rights to purchase the shares may be exercised 10 years  
Time Period Three [Member] | Daegu Green Power Co., Ltd.    
Disclosure Of Investments in Associates and Joint Ventures [Line Items]    
Duration from the date of investment after which the rights to purchase the shares may be exercised 13 years  
Korea Gas Corporation    
Disclosure Of Investments in Associates and Joint Ventures [Line Items]    
Post tax discount rate 4.90% 4.60%
Gemeng International Energy Co., Ltd. | Woori Spot PEF [Member]    
Disclosure Of Investments in Associates and Joint Ventures [Line Items]    
Put options as a percentage of shares 8.00%  
Operating fees percentage 1.00%  
Maturity date of the put options Dec. 25, 2023