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Commitments and Contingencies - Summary of Guarantees Provided by the Group for Third Parties (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [Line Items]    
Used amount ₩ 6,683,662 ₩ 8,120,791
Shinhan Bank [Member] | Guarantees [member]    
Disclosure of detailed information about borrowings [Line Items]    
Subject to payment guarantees Daegu Beomeo -Crossroads SeohanIDaum Buyers  
Limit ₩ 81,722  
Used amount ₩ 14,237  
Cash Payers [member] | Guarantees [member]    
Disclosure of detailed information about borrowings [Line Items]    
Subject to payment guarantees KEB Hana Bank  
Limit ₩ 384  
KT Estate Inc. [member] | Shinhan Bank [Member] | Guarantees [member]    
Disclosure of detailed information about borrowings [Line Items]    
Subject to payment guarantees Busan Gaya Centreville Buyers  
Limit ₩ 48,536  
Used amount ₩ 8,309  
Bottom of range [member] | Shinhan Bank [Member] | Guarantees [member]    
Disclosure of detailed information about borrowings [Line Items]    
Maturity Oct 29, 2017  
Bottom of range [member] | Cash Payers [member] | Guarantees [member]    
Disclosure of detailed information about borrowings [Line Items]    
Maturity Apr 19, 2017  
Bottom of range [member] | KT Estate Inc. [member] | Shinhan Bank [Member] | Guarantees [member]    
Disclosure of detailed information about borrowings [Line Items]    
Maturity Nov 10, 2017  
Top of range [member] | Shinhan Bank [Member] | Guarantees [member]    
Disclosure of detailed information about borrowings [Line Items]    
Maturity Nov. 30, 2020  
Top of range [member] | Cash Payers [member] | Guarantees [member]    
Disclosure of detailed information about borrowings [Line Items]    
Maturity Apr 19, 2018  
Top of range [member] | KT Estate Inc. [member] | Shinhan Bank [Member] | Guarantees [member]    
Disclosure of detailed information about borrowings [Line Items]    
Maturity Oct. 31, 2020