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Liability under insurance contracts and reinsurance contracts - Summary of Changes in the remaining coverage elements and occurrence elements of reinsurance contract assets (liabilities) (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 other than those 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, Incurred reinsurance claims 1,759,178 1,655,435 1,573,969
Reinsurance revenue-Changes in liabilities for incurred claims 185,968 130,423 116,545
Reinsurance revenue, Other (18,265) (17,984) (7,479)
Reinsurance revenue 3,262,380 3,051,999 2,859,958
Reinsurance service expense 2,201,439 2,055,165  
Recovery of investment elements and reinsurance premiums (4,693,623) (4,941,397)  
Reinsurance finance income and expense 1,103,938 4,950,718  
Cash flow for the period, Receipts of investment components and recoveries of reinsurance premiums 7,797,683 6,897,049  
Cash flow for the period (705,050) (1,221,006)  
Other increases (decreases) (133) (9)  
Insurance contracts other than those to which premium allocation approach has been applied [member] | Excluding loss recovery factors [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Reinsurance service expense 413,088 332,203  
Recovery of investment elements and reinsurance premiums 0 0  
Reinsurance finance income and expense 1,045,891 4,823,422  
Cash flow for the period, Receipts of investment components and recoveries of reinsurance premiums 7,797,683 6,897,049  
Cash flow for the period 5,728,901 5,304,237  
Other increases (decreases) 30 (3)  
Insurance contracts other than those to which premium allocation approach has been applied [member] | Loss recovery factor [member]      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Reinsurance service expense (14,152) 47,812  
Recovery of investment elements and reinsurance premiums 0 0  
Reinsurance finance income and expense (4,478) 60,060  
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) (160) (6)  
Reinsurance contracts held [member] | Insurance contracts other than those 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]      
Beginning balance, Reinsurance contract assets 107,689 62,814  
Beginning balance, Reinsurance contract liabilities (98,058) (93,162)  
Beginning balance, Net reinsurance contract assets (liabilities) 9,631 (30,348)  
Reinsurance revenue, Incurred reinsurance claims 185,015 89,856  
Reinsurance revenue-Changes in liabilities for incurred claims (34,225) (29,334)  
Reinsurance revenue, Other 14,184 (7,381)  
Reinsurance revenue 164,974 53,141  
Reinsurance service expense, Fair value method (68,563) (28,839)  
Reinsurance service expense, other (81,875) (28,514)  
Reinsurance service expense (150,438) (57,353)  
Recovery of investment elements and reinsurance premiums 0 0  
Reinsurance finance income and expense, profit or loss 10,882 62  
Reinsurance finance income and expense, Other comprehensive income (211,709) (2,091)  
Reinsurance finance income and expense (200,827) (2,029)  
Cash flow for the period, Reinsurance premium paid 969,789 221,033  
Cash flow for the period, Recoveries of reinsurance claims and other reinsurance income (130,014) (33,580)  
Cash flow for the period, Receipts of investment components and recoveries of reinsurance premiums (225,026) (140,620)  
Cash flow for the period 614,749 46,833  
Other increases (decreases) 0 (613)  
Ending balance, Reinsurance contract assets 494,467 107,689 62,814
Ending balance, Reinsurance contract liabilities (56,378) (98,058) (93,162)
Ending balance, Net reinsurance contract assets (liabilities) 438,089 9,631 (30,348)
Reinsurance contracts held [member] | Insurance contracts other than those to which premium allocation approach has been applied [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 47,331 19,436  
Beginning balance, Reinsurance contract liabilities (153,155) (143,204)  
Beginning balance, Net reinsurance contract assets (liabilities) (105,824) (123,768)  
Reinsurance revenue, Incurred reinsurance claims 0 0  
Reinsurance revenue-Changes in liabilities for incurred claims 0 0  
Reinsurance revenue, Other 60 10  
Reinsurance revenue 60 10  
Reinsurance service expense, Fair value method (68,563) (28,839)  
Reinsurance service expense, other (81,875) (28,514)  
Reinsurance service expense (150,438) (57,353)  
Recovery of investment elements and reinsurance premiums (249,075) (143,510)  
Reinsurance finance income and expense, profit or loss 9,055 (1,350)  
Reinsurance finance income and expense, Other comprehensive income (211,893) (2,685)  
Reinsurance finance income and expense (202,838) (4,035)  
Cash flow for the period, Reinsurance premium paid 969,789 221,033  
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 21,694 2,348  
Cash flow for the period 991,483 223,381  
Other increases (decreases) (119) (549)  
Ending balance, Reinsurance contract assets 433,672 47,331 19,436
Ending balance, Reinsurance contract liabilities (150,423) (153,155) (143,204)
Ending balance, Net reinsurance contract assets (liabilities) 283,249 (105,824) (123,768)
Reinsurance contracts held [member] | Insurance contracts other than those to which premium allocation approach has been applied [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 3,806 5,055  
Beginning balance, Reinsurance contract liabilities 17,187 23,112  
Beginning balance, Net reinsurance contract assets (liabilities) 20,993 28,167  
Reinsurance revenue, Incurred reinsurance claims 0 0  
Reinsurance revenue-Changes in liabilities for incurred claims 0 0  
Reinsurance revenue, Other 14,124 (7,391)  
Reinsurance revenue 14,124 (7,391)  
Reinsurance service expense, Fair value method 0 0  
Reinsurance service expense, other 0 0  
Reinsurance service expense 0 0  
Recovery of investment elements and reinsurance premiums 0 0  
Reinsurance finance income and expense, profit or loss (4) 37  
Reinsurance finance income and expense, Other comprehensive income 13 244  
Reinsurance finance income and expense 9 281  
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) 119 (64)  
Ending balance, Reinsurance contract assets 3,922 3,806 5,055
Ending balance, Reinsurance contract liabilities 31,323 17,187 23,112
Ending balance, Net reinsurance contract assets (liabilities) 35,245 20,993 28,167
Reinsurance contracts held [member] | Insurance contracts other than those to which premium allocation approach has been applied [member] | Incurred claim component      
Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items]      
Beginning balance, Reinsurance contract assets 56,552 38,323  
Beginning balance, Reinsurance contract liabilities 37,910 26,930  
Beginning balance, Net reinsurance contract assets (liabilities) 94,462 65,253  
Reinsurance revenue, Incurred reinsurance claims 185,015 89,856  
Reinsurance revenue-Changes in liabilities for incurred claims (34,225) (29,334)  
Reinsurance revenue, Other 0 0  
Reinsurance revenue 150,790 60,522  
Reinsurance service expense, Fair value method 0 0  
Reinsurance service expense, other 0 0  
Reinsurance service expense 0 0  
Recovery of investment elements and reinsurance premiums 249,075 143,510  
Reinsurance finance income and expense, profit or loss 1,831 1,375  
Reinsurance finance income and expense, Other comprehensive income 171 350  
Reinsurance finance income and expense 2,002 1,725  
Cash flow for the period, Reinsurance premium paid 0 0  
Cash flow for the period, Recoveries of reinsurance claims and other reinsurance income (130,014) (33,580)  
Cash flow for the period, Receipts of investment components and recoveries of reinsurance premiums (246,720) (142,968)  
Cash flow for the period (376,734) (176,548)  
Other increases (decreases) 0 0  
Ending balance, Reinsurance contract assets 56,873 56,552 38,323
Ending balance, Reinsurance contract liabilities 62,722 37,910 26,930
Ending balance, Net reinsurance contract assets (liabilities) ₩ 119,595 ₩ 94,462 ₩ 65,253