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Insurance Risk - Summary of changes in major assumptions on Interest rate risk insurance contract liabilities (assets) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Interest rate risk [member] | Financial assets at fair value through profit or loss    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
Increase in Profit and Loss Effect [1] ₩ (26,466) ₩ (35,934)
Decrease in Profit and Loss Effect [1] 26,563 35,934
Interest rate risk [member] | Financial assets at fair value through other comprehensive income    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
Increase in Capital Effect [1] (4,736,892) (4,777,699)
Decrease in Capital Effect [1] 5,800,791 5,837,965
Interest rate risk [member] | Insurance contracts [member]    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
Increase in Profit and Loss Effect 0 0
Decrease in Profit and Loss Effect 0 0
Increase in Capital Effect 5,066,153 4,357,244
Decrease in Capital Effect (6,484,658) (6,073,734)
Interest rate risk [member] | Insurance contracts [member] | Insurance Contract Participating [Member]    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
Increase in Profit and Loss Effect [2] 0 0
Decrease in Profit and Loss Effect [2] 0 0
Increase in Capital Effect [2] 509,420 539,618
Decrease in Capital Effect [2] (620,972) (658,212)
Interest rate risk [member] | Insurance contracts [member] | Insurance Contract Non Participating [Member]    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
Increase in Profit and Loss Effect [2] 0 0
Decrease in Profit and Loss Effect [2] 0 0
Increase in Capital Effect [2] 4,535,425 3,772,927
Decrease in Capital Effect [2] (5,802,811) (5,332,780)
Interest rate risk [member] | Insurance contracts [member] | Insurance Contract Variable [Member]    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
Increase in Profit and Loss Effect [2] 0 0
Decrease in Profit and Loss Effect [2] 0 0
Increase in Capital Effect [2] 21,308 44,699
Decrease in Capital Effect [2] (60,875) (82,742)
Interest rate risk [member] | Reinsurance Contract [member]    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
Increase in Profit and Loss Effect [2] 0 0
Decrease in Profit and Loss Effect [2] 0 0
Increase in Capital Effect [2] 255,489 50,365
Decrease in Capital Effect [2] (308,842) (59,948)
Equity price risk [member] | Financial assets at fair value through profit or loss    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
Increase in Profit and Loss Effect 255,595 193,578
Decrease in Profit and Loss Effect (255,595) (193,578)
Equity price risk [member] | Financial assets at fair value through other comprehensive income    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
Increase in Capital Effect 0 0
Decrease in Capital Effect 0 0
Equity price risk [member] | Insurance contracts [member]    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
Increase in Profit and Loss Effect (255,595) (193,578)
Decrease in Profit and Loss Effect 255,595 193,578
Increase in Capital Effect 0 0
Decrease in Capital Effect 0 0
Equity price risk [member] | Insurance contracts [member] | Insurance Contract Participating [Member]    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
Increase in Profit and Loss Effect 0 0
Decrease in Profit and Loss Effect 0 0
Increase in Capital Effect 0 0
Decrease in Capital Effect 0 0
Equity price risk [member] | Insurance contracts [member] | Insurance Contract Non Participating [Member]    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
Increase in Profit and Loss Effect 0 0
Decrease in Profit and Loss Effect 0 0
Increase in Capital Effect 0 0
Decrease in Capital Effect 0 0
Equity price risk [member] | Insurance contracts [member] | Insurance Contract Variable [Member]    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
Increase in Profit and Loss Effect (255,595) (193,578)
Decrease in Profit and Loss Effect 255,595 193,578
Increase in Capital Effect 0 0
Decrease in Capital Effect 0 0
Equity price risk [member] | Reinsurance Contract [member]    
Disclosure of sensitivity analysis to changes in risk variables that arise from contracts within scope of IFRS 17 [line items]    
Increase in Profit and Loss Effect 0 0
Decrease in Profit and Loss Effect 0 0
Increase in Capital Effect 0 0
Decrease in Capital Effect ₩ 0 ₩ 0
[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] This is the impact on equity (before tax) due to changes in expected cash flows of insurance and reinsurance contracts, excluding variable annuities/savings.