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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
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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

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