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Liability under insurance contracts and reinsurance contracts - Summary of insurance contract liabilities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure Of Analysis Of Insurance Contract Liability [Line Items]    
Insurance contract assets ₩ (760) ₩ (5,639)
Insurance contract liabilities 50,471,303 51,124,991
Net insurance contract liabilities (assets) 50,470,543 51,119,352
Reinsurance contract assets 603,442 184,754
Reinsurance contract liabilities (56,378) (98,063)
Total net reinsurance contract assets (liabilities) 547,064 86,691
Death [member]    
Disclosure Of Analysis Of Insurance Contract Liability [Line Items]    
Insurance contract assets 0 0
Insurance contract liabilities 20,174,773 20,021,186
Net insurance contract liabilities (assets) 20,174,773 20,021,186
Reinsurance contract assets 0 0
Reinsurance contract liabilities (24,641) (26,214)
Total net reinsurance contract assets (liabilities) (24,641) (26,214)
Health [member]    
Disclosure Of Analysis Of Insurance Contract Liability [Line Items]    
Insurance contract assets 0 0
Insurance contract liabilities 5,081,797 5,556,614
Net insurance contract liabilities (assets) 5,081,797 5,556,614
Reinsurance contract assets 0 0
Reinsurance contract liabilities (31,737) (71,844)
Total net reinsurance contract assets (liabilities) (31,737) (71,844)
Pension Savings [member]    
Disclosure Of Analysis Of Insurance Contract Liability [Line Items]    
Insurance contract assets 0 0
Insurance contract liabilities 19,060,216 20,227,829
Net insurance contract liabilities (assets) 19,060,216 20,227,829
Reinsurance contract assets 0 0
Reinsurance contract liabilities 0 0
Total net reinsurance contract assets (liabilities) 0 0
Variable [member]    
Disclosure Of Analysis Of Insurance Contract Liability [Line Items]    
Insurance contract assets 0 0
Insurance contract liabilities 5,984,497 5,157,827
Net insurance contract liabilities (assets) 5,984,497 5,157,827
Reinsurance contract assets 0 0
Reinsurance contract liabilities 0 0
Total net reinsurance contract assets (liabilities) 0 0
Complex [member]    
Disclosure Of Analysis Of Insurance Contract Liability [Line Items]    
Insurance contract assets 0 0
Insurance contract liabilities 0 0
Net insurance contract liabilities (assets) 0 0
Reinsurance contract assets 494,226 107,668
Reinsurance contract liabilities 0 0
Total net reinsurance contract assets (liabilities) 494,226 107,668
Long-term [member]    
Disclosure Of Analysis Of Insurance Contract Liability [Line Items]    
Insurance contract assets (760) (1,051)
Insurance contract liabilities 433 0
Net insurance contract liabilities (assets) (327) (1,051)
Reinsurance contract assets 241 21
Reinsurance contract liabilities 0 0
Total net reinsurance contract assets (liabilities) 241 21
General [member]    
Disclosure Of Analysis Of Insurance Contract Liability [Line Items]    
Insurance contract assets 0 (4,588)
Insurance contract liabilities 168,767 160,346
Net insurance contract liabilities (assets) 168,767 155,758
Reinsurance contract assets 108,975 77,065
Reinsurance contract liabilities 0 (5)
Total net reinsurance contract assets (liabilities) 108,975 77,060
Automobile [member]    
Disclosure Of Analysis Of Insurance Contract Liability [Line Items]    
Insurance contract assets 0 0
Insurance contract liabilities 820 1,189
Net insurance contract liabilities (assets) 820 1,189
Reinsurance contract assets 0 0
Reinsurance contract liabilities 0 0
Total net reinsurance contract assets (liabilities) ₩ 0 ₩ 0