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Insurance Risk - Summary of interest rate risk and interest rate changes on profit and loss (Details) - Interest rate risk [member] - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Interest Rate Risk Arising From Insurance Contracts [Line Items]    
Exposure to financial products measured at fair value [1] ₩ 47,717,387 ₩ 48,843,348
Insurance contract exposure [2] 38,728,601 39,820,036
Net exposure (financial products - insurance contracts) 8,988,786 9,023,312
Insurance Contract Non Participating [Member]    
Interest Rate Risk Arising From Insurance Contracts [Line Items]    
Insurance Contract Participating Exposure [2] 4,738,480 4,979,280
Insurance Contract Non Participating Exposure [2] 28,289,432 29,628,025
Insurance Contract Variable Exposure [2] 5,528,259 4,773,118
Insurance Contract Others Exposure [2] ₩ 172,430 ₩ 439,613
[1] It is the total amount of financial assets measured at fair value through profit or loss, financial assets measured at fair value through other comprehensive income, and derivative assets (liabilities).
[2] It is the total amount excluding the contractual service margin from the remaining coverage component of insurance contract liabilities and reinsurance contract assets (liabilities).