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Liability under insurance contracts and reinsurance contracts - Summary of reconciliation of changes in insurance contracts by remaining coverage and incurred claims for which the applying the premium distribution approach (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Beginning balance, Reinsurance contract assets ₩ 184,754    
Beginning balance, Reinsurance contract liabilities 98,063    
Reinsurance revenue 3,364,322 ₩ 3,116,553 ₩ 2,899,599
Reinsurance finance income and expense, Other comprehensive income (211,733) (2,073) (28,283)
Reinsurance finance income and expense (1,191,195) (99,439) (516,097)
Ending balance, Reinsurance contract assets 603,442 184,754  
Ending balance, Reinsurance contract liabilities 56,378 98,063  
Insurance contracts to which premium allocation approach has been applied [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Reinsurance revenue 101,942 64,554 39,641
Insurance contracts to which premium allocation approach has been applied [member] | Reinsurance contracts held [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Beginning balance, Reinsurance contract assets 77,065 25,539  
Beginning balance, Reinsurance contract liabilities (5) (78)  
Beginning balance, Net reinsurance contract assets (liabilities) 77,060 25,461  
Reinsurance revenue, Incurred reinsurance claims 35,435 16,498  
Reinsurance revenue-Changes in liabilities for incurred claims 112 4,059  
Reinsurance revenue, Other 1,778 (120)  
Reinsurance revenue 37,325 20,437  
Reinsurance service expense (38,642) (18,052)  
Recovery of investment elements and reinsurance premiums 0 0  
Reinsurance finance income and expense, profit or loss 3,133 2,175  
Reinsurance finance income and expense, Other comprehensive income (24) 18  
Reinsurance finance income and expense 3,109 2,193  
Cash flow for the period, Reinsurance premium paid 42,773 2,128  
Cash flow for the period, Recoveries of reinsurance claims and other reinsurance income (12,650) 33,051  
Cash flow for the period, Receipts of investment components and recoveries of reinsurance premiums 0 0  
Cash flow for the period 30,123 35,179  
Other increases (decreases) 0 11,842  
Ending balance, Reinsurance contract assets 108,975 77,065 25,539
Ending balance, Reinsurance contract liabilities 0 (5) (78)
Ending balance, Net reinsurance contract assets (liabilities) 108,975 77,060 25,461
Insurance contracts to which premium allocation approach has been applied [member] | Reinsurance contracts held [member] | Present value estimate of future cash flows [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Beginning balance, Reinsurance contract assets 23,144 4,244  
Beginning balance, Reinsurance contract liabilities (5) (19)  
Beginning balance, Net reinsurance contract assets (liabilities) 23,139 4,225  
Reinsurance revenue, Incurred reinsurance claims 33,682 15,934  
Reinsurance revenue-Changes in liabilities for incurred claims 136 3,476  
Reinsurance revenue, Other 0 0  
Reinsurance revenue 33,818 19,410  
Reinsurance service expense 0 0  
Recovery of investment elements and reinsurance premiums 0 0  
Reinsurance finance income and expense, profit or loss 114 97  
Reinsurance finance income and expense, Other comprehensive income (19) 14  
Reinsurance finance income and expense 95 111  
Cash flow for the period, Reinsurance premium paid 0 0  
Cash flow for the period, Recoveries of reinsurance claims and other reinsurance income (12,650) 33,051  
Cash flow for the period, Receipts of investment components and recoveries of reinsurance premiums 0 0  
Cash flow for the period (12,650) 33,051  
Other increases (decreases) 0 (33,658)  
Ending balance, Reinsurance contract assets 44,402 23,144 4,244
Ending balance, Reinsurance contract liabilities 0 (5) (19)
Ending balance, Net reinsurance contract assets (liabilities) 44,402 23,139 4,225
Insurance contracts to which premium allocation approach has been applied [member] | Reinsurance contracts held [member] | Risk adjustment for non-financial risks [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Beginning balance, Reinsurance contract assets 1,517 104  
Beginning balance, Reinsurance contract liabilities 0 0  
Beginning balance, Net reinsurance contract assets (liabilities) 1,517 104  
Reinsurance revenue, Incurred reinsurance claims 1,753 564  
Reinsurance revenue-Changes in liabilities for incurred claims (24) 838  
Reinsurance revenue, Other 0 0  
Reinsurance revenue 1,729 1,402  
Reinsurance service expense 0 0  
Recovery of investment elements and reinsurance premiums 0 0  
Reinsurance finance income and expense, profit or loss 35 7  
Reinsurance finance income and expense, Other comprehensive income (5) 4  
Reinsurance finance income and expense 30 11  
Cash flow for the period, Reinsurance premium paid 0 0  
Cash flow for the period, Recoveries of reinsurance claims and other reinsurance income 0 0  
Cash flow for the period, Receipts of investment components and recoveries of reinsurance premiums 0 0  
Cash flow for the period 0 0  
Other increases (decreases) 0 0  
Ending balance, Reinsurance contract assets 3,276 1,517 104
Ending balance, Reinsurance contract liabilities 0 0 0
Ending balance, Net reinsurance contract assets (liabilities) 3,276 1,517 104
Insurance contracts to which premium allocation approach has been applied [member] | Reinsurance contracts held [member] | Excluding loss recovery factors [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Beginning balance, Reinsurance contract assets 51,439 19,971  
Beginning balance, Reinsurance contract liabilities 0 (59)  
Beginning balance, Net reinsurance contract assets (liabilities) 51,439 19,912  
Reinsurance revenue, Incurred reinsurance claims 0 0  
Reinsurance revenue-Changes in liabilities for incurred claims 0 0  
Reinsurance revenue, Other 0 (120)  
Reinsurance revenue 0 (120)  
Reinsurance service expense (38,642) (18,052)  
Recovery of investment elements and reinsurance premiums 0 0  
Reinsurance finance income and expense, profit or loss 2,984 2,071  
Reinsurance finance income and expense, Other comprehensive income 0 0  
Reinsurance finance income and expense 2,984 2,071  
Cash flow for the period, Reinsurance premium paid 42,773 2,128  
Cash flow for the period, Recoveries of reinsurance claims and other reinsurance income 0 0  
Cash flow for the period, Receipts of investment components and recoveries of reinsurance premiums 0 0  
Cash flow for the period 42,773 2,128  
Other increases (decreases) 0 45,500  
Ending balance, Reinsurance contract assets 58,554 51,439 19,971
Ending balance, Reinsurance contract liabilities 0 0 (59)
Ending balance, Net reinsurance contract assets (liabilities) 58,554 51,439 19,912
Insurance contracts to which premium allocation approach has been applied [member] | Reinsurance contracts held [member] | Loss recovery factor [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Beginning balance, Reinsurance contract assets 965 1,220  
Beginning balance, Reinsurance contract liabilities 0 0  
Beginning balance, Net reinsurance contract assets (liabilities) 965 1,220  
Reinsurance revenue, Incurred reinsurance claims 0 0  
Reinsurance revenue-Changes in liabilities for incurred claims 0 (255)  
Reinsurance revenue, Other 1,778 0  
Reinsurance revenue 1,778 (255)  
Reinsurance service expense 0 0  
Recovery of investment elements and reinsurance premiums 0 0  
Reinsurance finance income and expense, profit or loss 0 0  
Reinsurance finance income and expense, Other comprehensive income 0 0  
Reinsurance finance income and expense 0 0  
Cash flow for the period, Reinsurance premium paid 0 0  
Cash flow for the period, Recoveries of reinsurance claims and other reinsurance income 0 0  
Cash flow for the period, Receipts of investment components and recoveries of reinsurance premiums 0 0  
Cash flow for the period 0 0  
Other increases (decreases) 0 0  
Ending balance, Reinsurance contract assets 2,743 965 1,220
Ending balance, Reinsurance contract liabilities 0 0 0
Ending balance, Net reinsurance contract assets (liabilities) ₩ 2,743 ₩ 965 ₩ 1,220