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Debt securities issued - Summary of debt securities issued (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Debt securities issued [Line Items] |  |
Debt securities issued, gross | ₩ 92,991,422 | ₩ 93,765,854
In Korean won |  |
Debt securities issued [Line Items] |  |
Debt securities issued, gross | 74,937,216 | 75,106,885
In foreign currency |  |
Debt securities issued [Line Items] |  |
Debt securities issued, gross | ₩ 18,054,206 | ₩ 18,658,969
Debt securities issued | In Korean won |  |
Debt securities issued [Line Items] |  |
Maximum interest rate | 9.50% | 9.50%
Minimum interest rate | 1.43% | 1.00%
Debt securities issued, gross | ₩ 72,212,922 | ₩ 72,561,043
Debt securities issued | In foreign currency |  |
Debt securities issued [Line Items] |  |
Maximum interest rate | 5.40% | 6.60%
Minimum interest rate | 0.98% | 0.98%
Debt securities issued, gross | ₩ 14,012,181 | ₩ 13,979,805
Subordinated debt securities issued | In Korean won |  |
Debt securities issued [Line Items] |  |
Maximum interest rate | 5.20% | 5.20%
Minimum interest rate | 2.20% | 2.20%
Debt securities issued, gross | ₩ 3,014,773 | ₩ 2,820,105
Subordinated debt securities issued | In foreign currency |  |
Debt securities issued [Line Items] |  |
Maximum interest rate | 5.75% | 5.75%
Minimum interest rate | 3.75% | 3.34%
Debt securities issued, gross | ₩ 4,186,893 | ₩ 4,995,972
Gain on fair value hedges | In Korean won |  |
Debt securities issued [Line Items] |  |
Gain on fair value hedges | (195,980) | (188,774)
Gain on fair value hedges | In foreign currency |  |
Debt securities issued [Line Items] |  |
Gain on fair value hedges | (87,714) | (250,628)
Discount on debt securities issued | In Korean won |  |
Debt securities issued [Line Items] |  |
Discount on debt securities issued | (94,499) | (85,489)
Discount on debt securities issued | In foreign currency |  |
Debt securities issued [Line Items] |  |
Discount on debt securities issued | ₩ (57,154) | ₩ (66,180)

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