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Financial risk management - Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Level 2 | Financial asset at FVTPL |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Carrying value | ₩ 42,473,731 | ₩ 39,897,328
Level 2 | Financial asset at FVTPL | Debt securities |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Valuation technique | DCF, NAV,Option model (*) | DCF, NAV, Option model (*)
Carrying value | ₩ 42,011,753 | ₩ 39,833,051
Significant unobservable inputs and range | Discount rate, interest rate, stock price, etc. | Discount rate, interest rate, stock price, etc.
Level 2 | Financial asset at FVTPL | Equity securities |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Valuation technique | NAV,Option model (*) | NAV
Carrying value | ₩ 461,978 | ₩ 64,277
Significant unobservable inputs and range | Price of underlying assets such as stocks, bonds, etc., dividend yield | Price of underlying assets such as stocks, bonds, etc.
Level 2 | Derivative assets |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Carrying value | ₩ 6,493,825 | ₩ 9,474,641
Level 2 | Derivative assets | Trading |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Valuation technique | Option model (*), Implied forward interest rate,DCF | Option model (*), Implied forward interest rate, DCF
Carrying value | ₩ 5,876,734 | ₩ 8,772,280
Significant unobservable inputs and range | Discount rate, foreign exchange rate, volatility, stock price, commodity index, etc. | Discount rate, foreign exchange rate, volatility, stock price, commodity index, etc.
Level 2 | Derivative assets | Hedging |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Carrying value | ₩ 617,091 | ₩ 702,361
Level 2 | Securities at FVOCI |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Carrying value | ₩ 113,164,135 | ₩ 105,403,285
Level 2 | Securities at FVOCI | Debt securities |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Valuation technique | DCF,Option model (*) | DCF, Option model (*)
Carrying value | ₩ 64,196,579 | ₩ 56,031,316
Significant unobservable inputs and range | Interest rate, discount rate, etc. | Interest rate, discount rate, etc.
Level 3 |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Carrying value | ₩ 21,398,102 |
Level 3 | Financial asset at FVTPL |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Carrying value | ₩ 19,857,062 | ₩ 18,632,327
Level 3 | Financial asset at FVTPL | Debt securities |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Valuation technique | DCF, NAV, Option model (*1), Income approach | DCF, NAV, Option model (*1), Income approach
Carrying value | ₩ 18,349,801 | ₩ 17,217,401
Significant unobservable inputs and range | The volatility of the underlying asset, Discount rate, Correlations, Growth rate, Interest rate volatility, Liquidation Value | The volatility of the underlying asset, Discount rate, Correlations, Growth rate, Liquidation Value
Level 3 | Financial asset at FVTPL | Equity securities |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Valuation technique | DCF, NAV, Option model (*1), Comparable company analysis, Transaction case price, Dividend discount model (DDM), Cost method | DCF, NAV, Option model (*1),Comparable company analysis, Transaction case price, Dividend discount model (DDM), Cost method
Carrying value | ₩ 1,507,261 | ₩ 1,414,926
Significant unobservable inputs and range | The volatility of the underlying asset, Discount rate, Growth rate, Interest rate volatility, Liquidation Value | The volatility of the underlying asset, Discount rate, Growth rate, Interest rate volatility
Level 3 | Derivative assets |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Carrying value | ₩ 596,229 | ₩ 719,177
Level 3 | Derivative assets | Equity and foreign exchange related |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Valuation technique | Option model (*1) | Option model (*1)
Carrying value | ₩ 25,130 | ₩ 125,445
Significant unobservable inputs and range | The volatility of the underlying asset, Correlations | The volatility of the underlying asset, Correlations
Level 3 | Derivative assets | Interest rates related |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Carrying value | ₩ 71,254 | ₩ 85,141
Significant unobservable inputs and range | The volatility of the underlying asset, Correlations | The volatility of the underlying asset, Correlations
Level 3 | Derivative assets | Credit and commodity related |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Carrying value | ₩ 499,845 | ₩ 508,591
Significant unobservable inputs and range | The volatility of the underlying asset, Correlations, Hazard Rate | The volatility of the underlying asset, Correlations, Hazard Rate
Level 3 | Securities at FVOCI |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Carrying value | ₩ 944,811 | ₩ 20,273,695
Level 3 | Securities at FVOCI | Debt securities |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Valuation technique | Option model (*1) |
Carrying value | ₩ 9,139 |
Significant unobservable inputs and range | Discount rate, Interest rate volatility |
Level 3 | Securities at FVOCI | Equity securities |  |
Valuation techniques and inputs used in measuring the fair value of financial assets classified as level 2 & 3 [Line Items] |  |
Valuation technique | DCF, NAV, Option model (*1), Comparable company analysis, Cost method | DCF, NAV, Option model (*1),Comparable company analysis
Carrying value | ₩ 935,672 | ₩ 922,191
Significant unobservable inputs and range | The volatility of the underlying asset, Discount rate, Growth rate, Interest rate volatility, Liquidation Value | The volatility of the underlying asset, Discount rate, Growth rate,Interest rate volatility

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- Definition The description of inputs used in the fair value measurement of assets. Inputs are the assumptions that market participants would use when pricing the asset, including assumptions about risk such as the risk inherent in a particular valuation technique used to measure fair value (such as a pricing model) and the risk inherent in the inputs to the valuation technique. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2025-01-01 -Paragraph 93 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_d&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 95 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_c&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 95 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_c&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The description of the valuation techniques (for example, the market approach, cost approach and income approach) used for the fair value measurement of assets. [Refer: Valuation techniques used in fair value measurement [domain]; Cost approach [member]; Income approach [member]; Market approach [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 13 -IssueDate 2025-01-01 -Paragraph 93 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2025-en-r&anchor=para_93_d&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 95 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_c&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 95 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_95_c&doctype=Standard -URIDate 2025-03-27 + Details
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