v3.26.1
Insurance Risk Management - Summary of Cash Flows Related to Reinsurer Credit Rating Categories (Details) - Credit risk [member]
₩ in Millions
Dec. 31, 2025
KRW (₩)
Reinsurance Held Remaining Coverage Asset [Member] | Tongyang Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 ₩ 431,906
Reinsurance Held Remaining Coverage Asset [Member] | ABL Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 (129,334)
Reinsurance Held Remaining Coverage Asset [Member] | Aaa-~aa | Tongyang Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 354,143
Reinsurance Held Remaining Coverage Asset [Member] | Aaa-~aa | ABL Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 (129,334)
Reinsurance Held Remaining Coverage Asset [Member] | A+ ~ A- | Tongyang Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 77,763
Reinsurance Held Remaining Coverage Asset [Member] | A+ ~ A- | ABL Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 0
Reinsurance Held Remaining Coverage Asset [Member] | BBB+ or Lower | Tongyang Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 0
Reinsurance Held Remaining Coverage Asset [Member] | BBB+ or Lower | ABL Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 0
Reinsurance Held Remaining Coverage Asset [Member] | Unrated | Tongyang Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 0
Reinsurance Held Remaining Coverage Asset [Member] | Unrated | ABL Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 0
Reinsurance Held Incurred Claims Asset [Member] | Tongyang Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 5,650
Reinsurance Held Incurred Claims Asset [Member] | ABL Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 32,186
Reinsurance Held Incurred Claims Asset [Member] | Aaa-~aa | Tongyang Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 5,904
Reinsurance Held Incurred Claims Asset [Member] | Aaa-~aa | ABL Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 32,186
Reinsurance Held Incurred Claims Asset [Member] | A+ ~ A- | Tongyang Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 (254)
Reinsurance Held Incurred Claims Asset [Member] | A+ ~ A- | ABL Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 0
Reinsurance Held Incurred Claims Asset [Member] | BBB+ or Lower | Tongyang Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 0
Reinsurance Held Incurred Claims Asset [Member] | BBB+ or Lower | ABL Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 0
Reinsurance Held Incurred Claims Asset [Member] | Unrated | Tongyang Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 0
Reinsurance Held Incurred Claims Asset [Member] | Unrated | ABL Life Insurance Co., Ltd.  
Disclosure of information about credit risk that arises from contracts within scope of IFRS 17 [line items]  
Maximum exposure to credit risk that arises from contracts within scope of IFRS 17 ₩ 0