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Commitments and contingencies - Summary of guarantees, acceptances and credit commitments (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Guarantees    
Outstanding guarantees ₩ 18,642,539 ₩ 15,315,381
Contingent guarantees 4,917,473 5,068,782
ABS and ABCP purchase agreements 2,649,382 2,123,665
Subtotal 26,209,394 22,507,828
Commitments to extend credit    
Loan commitments in won 95,042,772 93,064,772
Loan commitments in foreign currency 25,559,545 28,613,692
Unused credit commitments 93,230,869 90,700,766
Other agreements 6,483,867 6,601,564
Subtotal 220,317,053 218,980,794
Endorsed bills    
Secured endorsed bills 12,574 1,367
Unsecured endorsed bills 10,560,935 11,937,894
Subtotal 10,573,509 11,939,261
Total ₩ 257,099,956 ₩ 253,427,883