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Borrowings - Summary of Short-term Borrowing (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]    
Short-term borrowings ₩ 92,614 ₩ 128,300
NongHyup Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Short-term borrowings 15,000  
Shinhan Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Short-term borrowings 59,800 113,300
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 16,200 12,000
SooHyup Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Short-term borrowings ₩ 1,000 ₩ 3,000
Short-term borrowings [member] | NongHyup Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 3.78%  
Short-term borrowings [member] | Shinhan Bank [member] | Bottom of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 3.70%  
Short-term borrowings [member] | Shinhan Bank [member] | Top of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 4.72%  
Short-term borrowings [member] | Sinhan Bank, Indonesia [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 8.90%  
Short-term borrowings [member] | Korea Development Bank [member] | Bottom of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 2.50%  
Short-term borrowings [member] | Korea Development Bank [member] | Top of range [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 4.35%  
Short-term borrowings [member] | SooHyup Bank [member]    
Disclosure of detailed information about borrowings [line items]    
Annual interest rates 4.57%