v3.26.1
Insurance contracts - Summary of the movements in the liability for remaining coverage and the liability for incurred claims (Details)
$ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2025
KRW (₩)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
KRW (₩)
Dec. 31, 2023
KRW (₩)
Dec. 31, 2025
USD ($)
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]          
Increase due to business combinations - Insurance contracts liabilities ₩ 45,573,864   ₩ 0   $ 31,548,831
Insurance service expense - Insurance expenses and insurance service expenses incurred 689,461        
Insurance service expense - Amortization of insurance acquisition cash flows 148,980        
Insurance finance interest income and other insurance finance income - Net income 9,186 $ 6,359 0 ₩ 0  
Insurance Finance Income or Expenses - Subtotal 1,786,814 $ 1,236,935 0 ₩ 0  
Insurance contracts issued [member]          
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]          
Beginning balance - Insurance contracts assets 0        
Beginning balance - Insurance contracts liabilities 0        
Beginning balance - Net insurance contracts liabilities (asset) 0        
Increase due to business combinations - Insurance contracts assets 0        
Increase due to business combinations - Insurance contracts liabilities 47,067,270        
Increase due to business combinations - Net insurance contracts liabilities (asset) 47,067,270        
Insurance income - Insurance contracts under conversion (1,005,778)        
Insurance income - Subtotal (1,005,778)        
Insurance service expense - Insurance expenses and insurance service expenses incurred 696,379        
Insurance service expense - Amortization of insurance acquisition cash flows 148,980        
Insurance service expense - Changes in liability for incurred claims 23,777        
Insurance service expense - Reversal of loss components 32,478        
Insurance Service Expenses - Subtotal 901,614        
Insurance Service Result (104,164)        
Insurance finance interest income and other insurance finance income - Net income 1,132,235        
Insurance finance interest income and other insurance finance income - Other comprehensive income [1] (2,395,876)        
Insurance Finance Income or Expenses - Subtotal (1,263,641)        
Total Changes in net income, other comprehensive income and insurance service result (1,367,805)        
Investment components excluded from insurance service result and insurance finance income 0        
Cash flow - Premiums received 3,496,221        
Cash flow - Insurance acquisition cash flow (649,882)        
Cash flow - Claims and other insurance service expenses paid including investment components (2,980,635)        
Cash flow - Subtotal (134,296)        
Other increase (decrease) 8,695        
Ending balance - Insurance contracts assets 0   0    
Ending balance - Insurance contracts liabilities 45,573,864   0    
Ending balance - Net insurance contracts liabilities (asset) 45,573,864   0    
Insurance contracts issued [member] | Excluding Loss Component [member]          
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]          
Beginning balance - Insurance contracts assets 0        
Beginning balance - Insurance contracts liabilities 0        
Beginning balance - Net insurance contracts liabilities (asset) 0        
Increase due to business combinations - Insurance contracts assets 0        
Increase due to business combinations - Insurance contracts liabilities 44,945,543        
Increase due to business combinations - Net insurance contracts liabilities (asset) 44,945,543        
Insurance income - Insurance contracts under conversion (1,005,778)        
Insurance income - Subtotal (1,005,778)        
Insurance service expense - Insurance expenses and insurance service expenses incurred 6,922        
Insurance service expense - Amortization of insurance acquisition cash flows 148,980        
Insurance service expense - Changes in liability for incurred claims 0        
Insurance service expense - Reversal of loss components 0        
Insurance Service Expenses - Subtotal 155,902        
Insurance Service Result (849,876)        
Insurance finance interest income and other insurance finance income - Net income 1,093,463        
Insurance finance interest income and other insurance finance income - Other comprehensive income (2,395,497)        
Insurance Finance Income or Expenses - Subtotal (1,302,034)        
Total Changes in net income, other comprehensive income and insurance service result (2,151,910)        
Investment components excluded from insurance service result and insurance finance income (2,308,250)        
Cash flow - Premiums received 3,496,221        
Cash flow - Insurance acquisition cash flow (649,882)        
Cash flow - Claims and other insurance service expenses paid including investment components (60,533)        
Cash flow - Subtotal 2,785,806        
Other increase (decrease) (738)        
Ending balance - Insurance contracts assets 0   0    
Ending balance - Insurance contracts liabilities 43,270,451   0    
Ending balance - Net insurance contracts liabilities (asset) 43,270,451   0    
Insurance contracts issued [member] | Loss component [member]          
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]          
Beginning balance - Insurance contracts assets 0        
Beginning balance - Insurance contracts liabilities 0        
Beginning balance - Net insurance contracts liabilities (asset) 0        
Increase due to business combinations - Insurance contracts assets 0        
Increase due to business combinations - Insurance contracts liabilities 121        
Increase due to business combinations - Net insurance contracts liabilities (asset) 121        
Insurance income - Insurance contracts under conversion 0        
Insurance income - Subtotal 0        
Insurance service expense - Insurance expenses and insurance service expenses incurred (288)        
Insurance service expense - Amortization of insurance acquisition cash flows 0        
Insurance service expense - Changes in liability for incurred claims 0        
Insurance service expense - Reversal of loss components 32,478        
Insurance Service Expenses - Subtotal 32,190        
Insurance Service Result 32,190        
Insurance finance interest income and other insurance finance income - Net income 63        
Insurance finance interest income and other insurance finance income - Other comprehensive income 0        
Insurance Finance Income or Expenses - Subtotal 63        
Total Changes in net income, other comprehensive income and insurance service result 32,253        
Investment components excluded from insurance service result and insurance finance income 0        
Cash flow - Premiums received 0        
Cash flow - Insurance acquisition cash flow 0        
Cash flow - Claims and other insurance service expenses paid including investment components 0        
Cash flow - Subtotal 0        
Other increase (decrease) 88        
Ending balance - Insurance contracts assets 0   0    
Ending balance - Insurance contracts liabilities 32,462   0    
Ending balance - Net insurance contracts liabilities (asset) 32,462   0    
Insurance contracts issued [member] | Liability (asset) for incurred claims          
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]          
Beginning balance - Insurance contracts assets 0        
Beginning balance - Insurance contracts liabilities 0        
Beginning balance - Net insurance contracts liabilities (asset) 0        
Increase due to business combinations - Insurance contracts assets 0        
Increase due to business combinations - Insurance contracts liabilities 2,121,606        
Increase due to business combinations - Net insurance contracts liabilities (asset) 2,121,606        
Insurance income - Insurance contracts under conversion 0        
Insurance income - Subtotal 0        
Insurance service expense - Insurance expenses and insurance service expenses incurred 689,745        
Insurance service expense - Amortization of insurance acquisition cash flows 0        
Insurance service expense - Changes in liability for incurred claims 23,777        
Insurance service expense - Reversal of loss components 0        
Insurance Service Expenses - Subtotal 713,522        
Insurance Service Result 713,522        
Insurance finance interest income and other insurance finance income - Net income 38,709        
Insurance finance interest income and other insurance finance income - Other comprehensive income (379)        
Insurance Finance Income or Expenses - Subtotal 38,330        
Total Changes in net income, other comprehensive income and insurance service result 751,852        
Investment components excluded from insurance service result and insurance finance income 2,308,250        
Cash flow - Premiums received 0        
Cash flow - Insurance acquisition cash flow 0        
Cash flow - Claims and other insurance service expenses paid including investment components (2,920,102)        
Cash flow - Subtotal (2,920,102)        
Other increase (decrease) 9,345        
Ending balance - Insurance contracts assets 0   0    
Ending balance - Insurance contracts liabilities 2,270,951   0    
Ending balance - Net insurance contracts liabilities (asset) ₩ 2,270,951   ₩ 0    
[1] The finance income recognized in other comprehensive income is the amount before deducting tax and non-controlling interests.