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Borrowings - Summary of Short-term Borrowing (Detail)
₩ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
KRW (₩)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
KRW (₩)
Dec. 31, 2022
USD ($)
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 0.00% 0.00%    
Short-term borrowings [member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings ₩ 425,785 $ 504,998    
Short-term borrowings [member] | NongHyup Bank [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 4.88% 4.88%    
Short-term borrowings ₩ 8,500   ₩ 9,000  
Short-term borrowings [member] | Shinhan Bank [member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings ₩ 151,500   105,000  
Short-term borrowings [member] | Shinhan Bank [member] | Bottom of range [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 3.84% 3.84%    
Short-term borrowings [member] | Shinhan Bank [member] | Top of range [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 6.43% 6.43%    
Short-term borrowings [member] | Shinhan Bank 1 [Member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings     30,000  
Short-term borrowings [member] | Korea Development Bank [member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings ₩ 34,900   27,201  
Short-term borrowings [member] | Korea Development Bank [member] | Bottom of range [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 3.23% 3.23%    
Short-term borrowings [member] | Korea Development Bank [member] | Top of range [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 4.95% 4.95%    
Short-term borrowings [member] | Woori Bank [Member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings     50,000  
Short-term borrowings [member] | Industrial Bank Of Korea [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 4.862% 4.862%    
Short-term borrowings ₩ 6,000   6,000  
Short-term borrowings [member] | Hana Bank [Member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings ₩ 4,800   5,000  
Annual interest rates description CD(91D)+0.126      
Short-term borrowings [member] | KB SECURITIES [Member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings ₩ 69,635   94,822  
Short-term borrowings [member] | KB SECURITIES [Member] | Bottom of range [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 4.11% 4.11%    
Short-term borrowings [member] | KB SECURITIES [Member] | Top of range [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 4.91% 4.91%    
Short-term borrowings [member] | NH INVESTMENT SECURITIES [Member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings     20,000  
Short-term borrowings [member] | HSBC [member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings ₩ 30,450 $ 23,600 23,451 $ 18,500
Annual interest rates description SOFR +2.100      
Short-term borrowings [member] | IBK Securities [Member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings     20,000  
Short-term borrowings [member] | Hi Investment Securities [Member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings     99,524  
Short-term borrowings [member] | Woori Bank One [Member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 4.40% 4.40%    
Short-term borrowings ₩ 70,000      
Short-term borrowings [member] | Nong Hyup Bank One [Member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings     ₩ 15,000  
Short-term borrowings [member] | Woori Bank Two [member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings ₩ 20,000      
Annual interest rates description CD(91D)+1.960      
Short-term borrowings [member] | Korea Investment [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 4.91% 4.91%    
Short-term borrowings ₩ 30,000