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Property and equipment - Insured assets (Details)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
KRW (₩)
Cash (including ATM)  
Insured assets [Line Items]  
Type of insurance Comprehensive insurance for financial institutions
Amount covered ₩ 29,500
Insurance company Samsung Fire & Marine Insurance Co., Ltd., etc.
Property total risk, Machine risk, General liability collateral  
Insured assets [Line Items]  
Type of insurance Comprehensive Property insurance
Amount covered ₩ 1,430,372
Insurance company Samsung Fire & Marine Insurance Co., Ltd., etc.
Business property and real estate  
Insured assets [Line Items]  
Type of insurance Fire insurance
Amount covered ₩ 20,008
Insurance company Hanwha General Insurance Co., Ltd., etc.
Officer liability of executives  
Insured assets [Line Items]  
Type of insurance Compensation liability insurance for officers
Amount covered ₩ 46,000
Insurance company Meritz Fire & Marine Insurance Co., Ltd., etc.
Cash and securities  
Insured assets [Line Items]  
Type of insurance Burglary insurance
Amount covered ₩ 60,000
Insurance company Samsung Fire & Marine Insurance Co., Ltd., etc.
Personal information liability insurance  
Insured assets [Line Items]  
Type of insurance Personal information liability insurance
Amount covered ₩ 26,090
Insurance company DB Insurance Co., Ltd., etc.
Others  
Insured assets [Line Items]  
Type of insurance Others
Amount covered ₩ 169,677
Insurance company Samsung Fire & Marine Insurance Co., Ltd., etc.