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Financial risk management - Maximum amount of exposure to credit risk by type of collateral (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk ₩ 293,790,329 ₩ 272,039,973
Guarantee    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 71,044,315 67,745,137
Deposits and Savings    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 3,227,198 2,915,179
Property and equipment    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 2,126,452 1,947,678
Real estate    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 214,902,714 197,422,000
Securities    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 2,475,236 2,002,292
Others    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 14,414 7,687
12-month expected credit losses    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 253,199,655 231,572,412
12-month expected credit losses | Guarantee    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 60,850,725 55,422,696
12-month expected credit losses | Deposits and Savings    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 2,825,303 2,508,238
12-month expected credit losses | Property and equipment    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 1,603,758 1,576,438
12-month expected credit losses | Real estate    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 185,544,412 170,210,822
12-month expected credit losses | Securities    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 2,363,043 1,846,531
12-month expected credit losses | Others    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 12,414 7,687
Lifetime expected credit losses    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 39,416,049 39,480,157
Lifetime expected credit losses | Guarantee    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 9,781,605 11,872,362
Lifetime expected credit losses | Deposits and Savings    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 399,325 401,970
Lifetime expected credit losses | Property and equipment    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 518,626 367,086
Lifetime expected credit losses | Real estate    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 28,636,383 26,682,978
Lifetime expected credit losses | Securities    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 78,110 155,761
Lifetime expected credit losses | Others    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 2,000  
Impaired    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 1,174,625 987,404
Impaired | Guarantee    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 411,985 450,079
Impaired | Deposits and Savings    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 2,570 4,971
Impaired | Property and equipment    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 4,068 4,154
Impaired | Real estate    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 721,919 528,200
Impaired | Securities    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk 34,083 ₩ 0
Impaired | Others    
Maximum amount of exposure to credit risk by type of collateral [Line Items]    
Maximum exposure to credit risk ₩ 0