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Commitments and Contingencies - Summary of Major Commitments with Local Financial Institutions (Detail) - Dec. 31, 2022
€ in Millions, ₩ in Millions, ¥ in Millions, $ in Millions, $ in Millions
KRW (₩)
USD ($)
EUR (€)
SGD ($)
JPY (¥)
Disclosure of detailed information about borrowings [line items]          
Limit ₩ 3,277,690 $ 2,983,017 € 7,700 $ 284,000 ¥ 0
Used amount 516,447 2,142,507 7,700 284,000 400,000
Bank overdraft [member] | Kookmin Bank and others [member]          
Disclosure of detailed information about borrowings [line items]          
Limit 372,000        
Used amount 0        
Inter-Korean Cooperation Fund [member] | Export-Import Bank of Korea [member]          
Disclosure of detailed information about borrowings [line items]          
Limit 37,700        
Used amount 1,974        
Economic Cooperation Business Insurance [member] | Export-Import Bank of Korea [member]          
Disclosure of detailed information about borrowings [line items]          
Limit 3,240        
Used amount 1,732        
Collateralised loans on electronic receivable-trade [member] | Kookmin Bank and others [member]          
Disclosure of detailed information about borrowings [line items]          
Limit 567,150        
Used amount 28,298        
Plus electronic notes payable [member] | Industrial Bank of Korea [member]          
Disclosure of detailed information about borrowings [line items]          
Limit 50,000        
Used amount 1,663        
Working capital loan | Korea Development Bank and others [member]          
Disclosure of detailed information about borrowings [line items]          
Limit 1,415,600        
Used amount 165,100        
Working capital loan | Shinhan Bank [member]          
Disclosure of detailed information about borrowings [line items]          
Limit | $   72,507      
Used amount | $   72,507      
Working capital loan | Woori Bank [Member]          
Disclosure of detailed information about borrowings [line items]          
Limit | €     7,700    
Used amount | €     € 7,700    
Facility loans [member] | Shinhan Bank and others [member]          
Disclosure of detailed information about borrowings [line items]          
Limit 824,000        
Used amount 309,680        
Derivatives transaction limit [member]          
Disclosure of detailed information about borrowings [line items]          
Used amount | $   100,000      
Derivatives transaction limit [member] | Korea Development Bank and others [member]          
Disclosure of detailed information about borrowings [line items]          
Limit | $   2,510,510      
Used amount | $   1,970,000      
Derivatives transaction limit [member] | Shinhan Bank [member]          
Disclosure of detailed information about borrowings [line items]          
Limit 8,000        
Used amount ₩ 8,000        
Derivatives transaction limit [member] | DBS Bank [Member]          
Disclosure of detailed information about borrowings [line items]          
Limit | $       284,000  
Used amount | $       $ 284,000  
Derivatives transaction limit [member] | Citi Bank [Member]          
Disclosure of detailed information about borrowings [line items]          
Limit | $   $ 400,000      
Used amount | ¥         ¥ 400,000