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Financial risk management - Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value [Line Items]    
Fair value ₩ 655,229,202 ₩ 608,153,540
Level 2 | Due from banks at amortized cost    
Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value [Line Items]    
Fair value ₩ 36,523,969 ₩ 37,621,375
Valuation technique DCF DCF
Significant inputs Discount rate Discount rate
Level 2 | Loans at amortized cost    
Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value [Line Items]    
Fair value ₩ 700,039 ₩ 965,455
Valuation technique DCF DCF
Significant inputs Discount rate, Credit spread, Prepayment rate Discount rate, Credit spread,Prepayment rate
Level 2 | Securities at amortized cost    
Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value [Line Items]    
Fair value ₩ 20,495,223 ₩ 21,524,864
Valuation technique DCF DCF
Significant inputs Discount rate Discount rate
Level 2 | Debt securities issued    
Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value [Line Items]    
Fair value ₩ 52,745,778 ₩ 56,359,813
Valuation technique DCF DCF
Significant inputs Discount rate Discount rate
Level 2 | Other financial liabilities    
Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value [Line Items]    
Fair value ₩ 22,535,595 ₩ 10,428,026
Valuation technique DCF DCF
Significant inputs Discount rate Discount rate
Level 2 | Other financial assets    
Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value [Line Items]    
Fair value ₩ 29,465,771 ₩ 13,474,763
Valuation technique DCF DCF
Significant inputs Discount rate Discount rate
Level 2 | Borrowings    
Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value [Line Items]    
Fair value ₩ 1,545,895 ₩ 1,217,745
Valuation technique DCF DCF
Significant inputs Discount rate Discount rate
Level 2 | Deposits    
Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value [Line Items]    
Fair value ₩ 183,355,459 ₩ 168,178,241
Valuation technique DCF DCF
Significant inputs Discount rate Discount rate
Level 3    
Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value [Line Items]    
Fair value ₩ 566,985,796 ₩ 535,340,313
Level 3 | Loans at amortized cost    
Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value [Line Items]    
Fair value ₩ 465,591,581 ₩ 451,759,297
Valuation technique DCF DCF
Significant inputs Discount rate, Credit spread, Prepayment rate Discount rate, Credit spread, Prepayment rate
Level 3 | Debt securities issued    
Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value [Line Items]    
Fair value ₩ 40,225,040 ₩ 38,010,591
Valuation technique DCF DCF
Significant inputs Discount rate,Regression coefficient,Correlations Discount rate,Regression coefficient,Correlations
Level 3 | Investment contract liabilities    
Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value [Line Items]    
Fair value ₩ 1,536,393 ₩ 1,165,022
Level 3 | Other financial liabilities    
Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value [Line Items]    
Fair value ₩ 35,297,011 ₩ 29,001,549
Valuation technique DCF DCF
Significant inputs Discount rate Discount rate
Level 3 | Other financial assets    
Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value [Line Items]    
Fair value ₩ 14,209,213 ₩ 9,994,559
Valuation technique DCF DCF
Significant inputs Discount rate Discount rate
Level 3 | Borrowings    
Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value [Line Items]    
Fair value ₩ 53,816,299 ₩ 48,767,969
Valuation technique DCF DCF
Significant inputs Discount rate Discount rate
Level 3 | Deposits    
Valuation techniques and inputs used in the fair value measurements categorized within Level 2 and Level 3 for fair value disclosures, which are not recognized at fair value [Line Items]    
Fair value ₩ 264,171,732 ₩ 255,024,584
Valuation technique DCF DCF
Significant inputs Discount rate Discount rate