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Statement of cash flows - Summary of cash and cash equivalents in the consolidated statements of cash flows (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statements [Line Items]        
Cash and due from banks at amortized cost ₩ 39,758,705 ₩ 40,547,054 ₩ 34,650,390  
Due from financial institutions with a maturity over three months from date of acquisition (966,755) (1,655,932) (1,322,274)  
Restricted due from banks (3,496,827) (3,643,579) (2,911,232)  
Total Cash Due from financial institutions and bank (4,463,582) (5,299,511) (4,233,506)  
Total ₩ 35,295,123 ₩ 35,247,543 ₩ 30,416,884 ₩ 24,413,946