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Borrowings - Summary of Short-term Borrowing (Detail)
₩ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
KRW (₩)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
KRW (₩)
Dec. 31, 2021
USD ($)
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 ₩ 504,998   ₩ 338,927  
Short-term borrowings [member] | NongHyup Bank [member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings ₩ 9,000      
Annual interest rates description COFIX(6M)+1.780      
Short-term borrowings [member] | NongHyup Bank [member] | Bottom of range [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 4.69% 4.69%    
Short-term borrowings [member] | NongHyup Bank [member] | Top of range [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 4.94% 4.94%    
Short-term borrowings [member] | Shinhan Bank [member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings ₩ 105,000   4,500  
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 6.44% 6.44%    
Short-term borrowings [member] | Shinhan Bank 1 [Member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings ₩ 30,000      
Annual interest rates description CD(91D)+1.750      
Short-term borrowings [member] | Korea Development Bank [member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings ₩ 27,201   16,000  
Short-term borrowings [member] | Korea Development Bank [member] | Bottom of range [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 4.63% 4.63%    
Short-term borrowings [member] | Korea Development Bank [member] | Top of range [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 6.20% 6.20%    
Short-term borrowings [member] | Woori Bank [Member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings ₩ 20,000   20,000  
Annual interest rates description KORIBOR(3M)+1.960      
Short-term borrowings [member] | Industrial Bank Of Korea [member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 4.88% 4.88%    
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 ₩ 5,000   5,000  
Annual interest rates description CD(91D)-0.020      
Short-term borrowings [member] | KB SECURITIES [Member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 5.904% 5.904%    
Short-term borrowings ₩ 94,822   71,000  
Short-term borrowings [member] | Shinhan Investment [Member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings     73,000  
Short-term borrowings [member] | KIWOOM Securities [Member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings     63,000  
Short-term borrowings [member] | NH INVESTMENT SECURITIES [Member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 5.07% 5.07%    
Short-term borrowings ₩ 20,000   53,000  
Short-term borrowings [member] | Korea Investment Securities [Member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings     10,000  
Short-term borrowings [member] | HSBC [Member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 5.09% 5.09%    
Short-term borrowings ₩ 23,451 $ 18,500 ₩ 17,427 $ 14,700
Short-term borrowings [member] | IBK Securities [Member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 5.07% 5.07%    
Short-term borrowings ₩ 20,000      
Short-term borrowings [member] | Hi Investment Securities and Others [Member]        
Disclosure of detailed information about borrowings [line items]        
Annual interest rates 3.71% 3.71%    
Short-term borrowings ₩ 99,524      
Short-term borrowings [member] | Woori Bank One [Member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings ₩ 30,000      
Annual interest rates description CD(91D)+1.430      
Short-term borrowings [member] | Nong Hyup Bank One [Member]        
Disclosure of detailed information about borrowings [line items]        
Short-term borrowings ₩ 15,000