v3.26.1
Insurance Risk Management - Summary of Amount Payable on Demand by Policyholders and the Carrying Amount of Related Insurance Contracts (Details) - Liquidity risk [member]
₩ in Millions
Dec. 31, 2025
KRW (₩)
Tongyang Life Insurance Co., Ltd.  
Summary of amount payable on demand by policyholders and the carrying amount of related insurance contracts [Line Items]  
Insurance contracts assets ₩ 0
Insurance contracts liabilities (51,296,140)
ABL Life Insurance Co., Ltd.  
Summary of amount payable on demand by policyholders and the carrying amount of related insurance contracts [Line Items]  
Insurance contracts assets 0
Insurance contracts liabilities (30,972,454)
Insurance Contract Assets | Tongyang Life Insurance Co., Ltd.  
Summary of amount payable on demand by policyholders and the carrying amount of related insurance contracts [Line Items]  
Amounts payable on demand that arise from contracts within scope of IFRS 17 0
Insurance contracts assets 0 [1]
Insurance Contract Assets | ABL Life Insurance Co., Ltd.  
Summary of amount payable on demand by policyholders and the carrying amount of related insurance contracts [Line Items]  
Amounts payable on demand that arise from contracts within scope of IFRS 17 0
Insurance contracts assets 0 [1]
Insurance Contract Liabilities | Tongyang Life Insurance Co., Ltd.  
Summary of amount payable on demand by policyholders and the carrying amount of related insurance contracts [Line Items]  
Amounts payable on demand that arise from contracts within scope of IFRS 17 30,166,347
Insurance contracts liabilities 27,657,058 [1]
Insurance Contract Liabilities | ABL Life Insurance Co., Ltd.  
Summary of amount payable on demand by policyholders and the carrying amount of related insurance contracts [Line Items]  
Amounts payable on demand that arise from contracts within scope of IFRS 17 18,666,324
Insurance contracts liabilities ₩ 17,916,806 [1]
[1] The amount payable on demand includes the estimated present value of future cash flows, risk adjustment, and contractual service margin as of the reporting date.