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Liability under insurance contracts and reinsurance contracts - Summary of insurance contracts that did not apply the premium allocation approach recognized (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Disclosure Of Insurance Contracts That Did Not Apply The Premium Allocation Approach Recognized For The First Time [Line Items]    
Contract recognized for the first time in the period Loss burden contract set, except for loss burden contract set ₩ 0 ₩ 0
Contract recognized for the first time in the period Loss burden contract set 32,646 27,640
Total 32,646 27,640
Other than insurance acquisition cash flow amount [member]    
Disclosure Of Insurance Contracts That Did Not Apply The Premium Allocation Approach Recognized For The First Time [Line Items]    
Contract recognized for the first time in the period Loss burden contract set, except for loss burden contract set 7,203,902 5,654,572
Contract recognized for the first time in the period Loss burden contract set 742,242 748,281
Total 7,946,144 6,402,853
Insurance acquisition cash flow amount [member]    
Disclosure Of Insurance Contracts That Did Not Apply The Premium Allocation Approach Recognized For The First Time [Line Items]    
Contract recognized for the first time in the period Loss burden contract set, except for loss burden contract set 2,065,657 1,725,595
Contract recognized for the first time in the period Loss burden contract set 104,758 119,002
Total 2,170,415 1,844,597
Present value estimate of future cash inflows [member]    
Disclosure Of Insurance Contracts That Did Not Apply The Premium Allocation Approach Recognized For The First Time [Line Items]    
Contract recognized for the first time in the period Loss burden contract set, except for loss burden contract set (11,135,497) (8,794,395)
Contract recognized for the first time in the period Loss burden contract set (822,990) (848,952)
Total (11,958,487) (9,643,347)
Risk adjustment for non-financial risks [member]    
Disclosure Of Insurance Contracts That Did Not Apply The Premium Allocation Approach Recognized For The First Time [Line Items]    
Contract recognized for the first time in the period Loss burden contract set, except for loss burden contract set 216,140 147,970
Contract recognized for the first time in the period Loss burden contract set 8,636 9,309
Total 224,776 157,279
Contractual service margin [member]    
Disclosure Of Insurance Contracts That Did Not Apply The Premium Allocation Approach Recognized For The First Time [Line Items]    
Contract recognized for the first time in the period Loss burden contract set, except for loss burden contract set 1,649,798 1,266,258
Contract recognized for the first time in the period Loss burden contract set 0 0
Total ₩ 1,649,798 ₩ 1,266,258