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Other operating expenses, net - Other operating income and other operating expense (Parenthetical) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
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.