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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, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]    
Used amount ₩ 7,298,867 ₩ 6,648,293
Shinhan Bank [member] | Guarantees [member]    
Disclosure of detailed information about borrowings [line items]    
Subject to payment guarantees Daegu Beomeo-Crossroads SeohanIDaum Buyers  
Limit ₩ 8,028  
Used amount ₩ 6,985  
Cash payers [member] | Guarantees [member]    
Disclosure of detailed information about borrowings [line items]    
Subject to payment guarantees Shinhan Bank  
Limit ₩ 683  
Used amount ₩ 0  
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 ₩ 4,829  
Used amount ₩ 4,137  
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, 2019  
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 17, 2020  
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