v3.26.1
Insurance Risk Management - Summary Of Fulfilment Cash Flows By Country In Which Life Insurance Co. Ltd. Provides Coverage Under Insurance Contracts (Details) - Insurance risk [member]
₩ in Millions
Dec. 31, 2025
KRW (₩)
Insurance contracts issued [member]  
Disclosure of nature and extent of risks that arise from contracts within scope of IFRS 17 [line items]  
Exposure to risk that arises from contracts within scope of IFRS 17 ₩ 25,686,541
Insurance contracts issued [member] | ABL Life Insurance Co., Ltd.  
Disclosure of nature and extent of risks that arise from contracts within scope of IFRS 17 [line items]  
Exposure to risk that arises from contracts within scope of IFRS 17 16,853,760
Insurance contracts issued [member] | Country of domicile [member]  
Disclosure of nature and extent of risks that arise from contracts within scope of IFRS 17 [line items]  
Exposure to risk that arises from contracts within scope of IFRS 17 25,686,541
Insurance contracts issued [member] | Country of domicile [member] | ABL Life Insurance Co., Ltd.  
Disclosure of nature and extent of risks that arise from contracts within scope of IFRS 17 [line items]  
Exposure to risk that arises from contracts within scope of IFRS 17 16,853,760
Insurance contracts issued [member] | Foreign countries [member]  
Disclosure of nature and extent of risks that arise from contracts within scope of IFRS 17 [line items]  
Exposure to risk that arises from contracts within scope of IFRS 17 0
Insurance contracts issued [member] | Foreign countries [member] | ABL Life Insurance Co., Ltd.  
Disclosure of nature and extent of risks that arise from contracts within scope of IFRS 17 [line items]  
Exposure to risk that arises from contracts within scope of IFRS 17 0
Reinsurance contracts held [member]  
Disclosure of nature and extent of risks that arise from contracts within scope of IFRS 17 [line items]  
Exposure to risk that arises from contracts within scope of IFRS 17 437,556
Reinsurance contracts held [member] | ABL Life Insurance Co., Ltd.  
Disclosure of nature and extent of risks that arise from contracts within scope of IFRS 17 [line items]  
Exposure to risk that arises from contracts within scope of IFRS 17 (97,148)
Reinsurance contracts held [member] | Country of domicile [member]  
Disclosure of nature and extent of risks that arise from contracts within scope of IFRS 17 [line items]  
Exposure to risk that arises from contracts within scope of IFRS 17 437,556
Reinsurance contracts held [member] | Country of domicile [member] | ABL Life Insurance Co., Ltd.  
Disclosure of nature and extent of risks that arise from contracts within scope of IFRS 17 [line items]  
Exposure to risk that arises from contracts within scope of IFRS 17 (97,148)
Reinsurance contracts held [member] | Foreign countries [member]  
Disclosure of nature and extent of risks that arise from contracts within scope of IFRS 17 [line items]  
Exposure to risk that arises from contracts within scope of IFRS 17 0
Reinsurance contracts held [member] | Foreign countries [member] | ABL Life Insurance Co., Ltd.  
Disclosure of nature and extent of risks that arise from contracts within scope of IFRS 17 [line items]  
Exposure to risk that arises from contracts within scope of IFRS 17 ₩ 0