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Borrowings - Summary of borrowings amount and interest rate (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Borrowings [Line Items] |  |
Borrowings, gross | ₩ 1,437,100 |
Borrowings | 55,394,834 | ₩ 49,920,373
Denominated in Korean won |  |
Borrowings [Line Items] |  |
Borrowings, gross | ₩ 25,549,274 | ₩ 26,975,265
Borrowings from Bank of Korea |  |
Borrowings [Line Items] |  |
Maximum Interest rate | 1.00% | 1.50%
Minimum Interest rate | 1.00% | 1.50%
Borrowings, gross | ₩ 3,574,907 | ₩ 3,106,011
Others |  |
Borrowings [Line Items] |  |
Maximum Interest rate | 5.22% | 5.72%
Minimum Interest rate | 0.00% | 0.00%
Borrowings, gross | ₩ 21,974,367 | ₩ 23,869,254
Denominated in foreign currency |  |
Borrowings [Line Items] |  |
Borrowings, gross | ₩ 13,470,863 | ₩ 10,335,183
Overdraft due from banks |  |
Borrowings [Line Items] |  |
Maximum Interest rate | 0.00% | 0.00%
Minimum Interest rate | 0.00% | 0.00%
Borrowings, gross | ₩ 54,293 | ₩ 30,837
Borrowings from banks |  |
Borrowings [Line Items] |  |
Maximum Interest rate | 19.50% | 16.25%
Minimum Interest rate | 0.00% | 0.00%
Borrowings, gross | ₩ 10,870,815 | ₩ 7,591,181
Others |  |
Borrowings [Line Items] |  |
Maximum Interest rate | 14.83% | 16.75%
Minimum Interest rate | 1.53% | 0.00%
Borrowings, gross | ₩ 2,545,755 | ₩ 2,713,165
Call money |  |
Borrowings [Line Items] |  |
Maximum Interest rate | 4.20% | 4.97%
Minimum Interest rate | 0.70% | 0.29%
Borrowings, gross |  | ₩ 1,197,823
Bills of sale |  |
Borrowings [Line Items] |  |
Maximum Interest rate | 2.79% | 3.23%
Minimum Interest rate | 0.00% | 0.00%
Borrowings, gross | ₩ 11,887 | ₩ 8,872
Bonds sold under repurchase agreements |  |
Borrowings [Line Items] |  |
Maximum Interest rate | 3.90% | 5.45%
Minimum Interest rate | 0.00% | 0.00%
Borrowings, gross | ₩ 14,988,698 | ₩ 11,542,956
Deferred origination costs |  |
Borrowings [Line Items] |  |
Deferred origination costs | ₩ (62,988) | ₩ (139,726)

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