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Equity - Changes in regulatory reserve for loan losses (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Changes in regulatory reserve for loan losses [Abstract] |  |
Beginning balance | ₩ 3,969,339 | ₩ 3,456,487
Expected regulatory reserve for loan losses | 274,226 | 512,852
Ending balance | ₩ 4,243,565 | ₩ 3,969,339

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