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Related Parties - Summary of Guarantees Provided To Related Parties (Parentheticals) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of Guarantees provided between the related parties [Line Items]    
Borrowings notional amount ₩ 6,615,470 ₩ 3,742,184
Saemangeum Heemang Photovoltaic Co., Ltd [Member] | Kookmin Bank [Member]    
Disclosure of Guarantees provided between the related parties [Line Items]    
Provision of guarantees or collateral by entity 63,400  
Borrowings notional amount 99,900  
Other borrowings 36,500  
Saemangeum Heemang Photovoltaic Co., Ltd [Member] | Kookmin Bank [Member] | Shares [Member]    
Disclosure of Guarantees provided between the related parties [Line Items]    
Financial assets pledged as collateral for liabilities or contingent liabilites 36,500  
Derivative liabilities [Member]    
Disclosure of Guarantees provided between the related parties [Line Items]    
Provision of guarantees or collateral by entity 6,760  
Acquisition cost of the securities [Member]    
Disclosure of Guarantees provided between the related parties [Line Items]    
Provision of guarantees or collateral by entity 47,067  
Other provisions [member]    
Disclosure of Guarantees provided between the related parties [Line Items]    
Provision of guarantees or collateral by entity 7,230  
Impairment loss [Member] | Naepo Green Energy Co., Ltd [Member]    
Disclosure of Guarantees provided between the related parties [Line Items]    
Provision of guarantees or collateral by entity ₩ 29,200