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Other operating expenses, net - Other operating income and other operating expense (Parenthetical) (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Net Other Operating Expense [Line Items] |  |  |  |
Other operating expense | [1] | ₩ 1,977,199 | ₩ 1,979,135 | ₩ 1,942,047
Vulnerable groups |  |  |  |
Net Other Operating Expense [Line Items] |  |  |  |
Other operating expense |  |  |  | ₩ 293,824
[1] | Includes W293,824 million for vulnerable groups such as self-employed people, small business owners and institutions supporting vulnerable groups, etc. in accordance with the “Banking financial support plan for people’s livelihood” for the year ended December 31, 2023.

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