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Insurance Risk - Summary of amount of the reinsurance contracts held (Details) - AA+ ~ AA- [member] - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Reinsurance Residual Coverage Assets [Member]    
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]    
Credit risk arising from insurance contracts ₩ 335,136 ₩ 0
Reinsurance Incident Assets [Member]    
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]    
Credit risk arising from insurance contracts ₩ 20,462 ₩ 146