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Provisions - Allowance for guarantees and acceptances (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2025
Dec. 31, 2024
Allowance for guarantees and acceptances [Abstract]    
Outstanding guarantees and acceptances ₩ 18,642,539 ₩ 15,315,381
Contingent guarantees and acceptances 4,917,473 5,068,782
ABS and ABCP purchase commitments 2,649,382 2,123,665
Endorsed bill 12,574 1,367
Total Guarantees and acceptances 26,221,968 22,509,195
Allowance for loss on guarantees and acceptances ₩ 111,307 ₩ 104,451
Ratio 0.42% 0.46%