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Provision for credit loss allowance - Summary of provision for allowance for credit loss on financial assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Provision for allowance for credit loss [Line Items]      
Allowance provided for credit loss ₩ (2,110,087) ₩ (2,017,585) ₩ (2,244,639)
Allowance provided (reversed) for credit loss (2,002,965) (2,013,274) (2,244,503)
Allowance Reversed For Credit Loss 107,122 4,311 136
Loans at amortized cost net category      
Provision for allowance for credit loss [Line Items]      
Allowance provided for credit loss (2,014,137) (1,862,013) (2,114,442)
Others      
Provision for allowance for credit loss [Line Items]      
Allowance provided for credit loss (70,035) (113,662) (90,770)
Securities at FVOCI      
Provision for allowance for credit loss [Line Items]      
Allowance provided for credit loss (25,915) 0 (2,271)
Allowance Reversed For Credit Loss 0 2,699 0
Unused credit line and financial guarantee      
Provision for allowance for credit loss [Line Items]      
Allowance provided for credit loss 0 (41,910) (37,156)
Allowance Reversed For Credit Loss 105,879 0 0
Securities at amortized cost      
Provision for allowance for credit loss [Line Items]      
Allowance Reversed For Credit Loss ₩ 1,243 ₩ 1,612 ₩ 136