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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
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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 |

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