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Borrowings - Summary of Short-term Borrowing (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]    
Short-term borrowings ₩ 83,500 ₩ 92,614
NongHyup Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Short-term borrowings 15,000 15,000
Shinhan Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Short-term borrowings 57,500 59,800
Sinhan Bank, Indonesia [member]    
Disclosure of detailed information about borrowings [line items]    
Short-term borrowings   614
Korea Development Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Short-term borrowings 10,000 16,200
SooHyup Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Short-term borrowings ₩ 1,000 ₩ 1,000
Short-term borrowings [member] | NongHyup Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 3.60%  
Short-term borrowings [member] | Shinhan Bank [member] | Bottom of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 3.33%  
Short-term borrowings [member] | Shinhan Bank [member] | Top of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 3.76%  
Short-term borrowings [member] | Korea Development Bank [member] | Top of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 3.85%  
Short-term borrowings [member] | SooHyup Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 4.20%