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Debt securities issued - Summary of debt securities issued (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Debt securities issued [Line Items]    
Debt securities issued, gross ₩ 92,991,422 ₩ 93,765,854
In Korean won    
Debt securities issued [Line Items]    
Debt securities issued, gross 74,937,216 75,106,885
In foreign currency    
Debt securities issued [Line Items]    
Debt securities issued, gross ₩ 18,054,206 ₩ 18,658,969
Debt securities issued | In Korean won    
Debt securities issued [Line Items]    
Maximum interest rate 9.50% 9.50%
Minimum interest rate 1.43% 1.00%
Debt securities issued, gross ₩ 72,212,922 ₩ 72,561,043
Debt securities issued | In foreign currency    
Debt securities issued [Line Items]    
Maximum interest rate 5.40% 6.60%
Minimum interest rate 0.98% 0.98%
Debt securities issued, gross ₩ 14,012,181 ₩ 13,979,805
Subordinated debt securities issued | In Korean won    
Debt securities issued [Line Items]    
Maximum interest rate 5.20% 5.20%
Minimum interest rate 2.20% 2.20%
Debt securities issued, gross ₩ 3,014,773 ₩ 2,820,105
Subordinated debt securities issued | In foreign currency    
Debt securities issued [Line Items]    
Maximum interest rate 5.75% 5.75%
Minimum interest rate 3.75% 3.34%
Debt securities issued, gross ₩ 4,186,893 ₩ 4,995,972
Gain on fair value hedges | In Korean won    
Debt securities issued [Line Items]    
Gain on fair value hedges (195,980) (188,774)
Gain on fair value hedges | In foreign currency    
Debt securities issued [Line Items]    
Gain on fair value hedges (87,714) (250,628)
Discount on debt securities issued | In Korean won    
Debt securities issued [Line Items]    
Discount on debt securities issued (94,499) (85,489)
Discount on debt securities issued | In foreign currency    
Debt securities issued [Line Items]    
Discount on debt securities issued ₩ (57,154) ₩ (66,180)