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Financial risk management - Valuation techniques and inputs used in measuring the fair value of financial liabilities classified as level 2 & 3 (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Level 2 |  |
Valuation techniques and inputs used in measuring the fair value of financial liabilities classified as level 2 & 3 [Line Items] |  |
Carrying value | ₩ 7,078,533 | ₩ 10,372,477
Level 2 | Financial liabilities designated at FVTPL |  |
Valuation techniques and inputs used in measuring the fair value of financial liabilities classified as level 2 & 3 [Line Items] |  |
Carrying value | 543,381 | 1,081,218
Level 2 | Derivative liabilities |  |
Valuation techniques and inputs used in measuring the fair value of financial liabilities classified as level 2 & 3 [Line Items] |  |
Carrying value | ₩ 6,535,152 | ₩ 9,291,259
Level 2 | Derivative-linked securities sold | Financial liabilities designated at FVTPL |  |
Valuation techniques and inputs used in measuring the fair value of financial liabilities classified as level 2 & 3 [Line Items] |  |
Valuation technique | Option model (*), NAV | Option model (*), NAV
Carrying value | ₩ 255,532 | ₩ 819,919
Significant unobservable inputs and range | Underlying asset price | Underlying asset price
Level 2 | Debt securities issued | Financial liabilities designated at FVTPL |  |
Valuation techniques and inputs used in measuring the fair value of financial liabilities classified as level 2 & 3 [Line Items] |  |
Carrying value | ₩ 287,849 | ₩ 261,299
Significant unobservable inputs and range | Discount rate, volatility | Discount rate, volatility
Level 2 | Trading | Derivative liabilities |  |
Valuation techniques and inputs used in measuring the fair value of financial liabilities classified as level 2 & 3 [Line Items] |  |
Valuation technique | Option model (*), Forward interest rate, DCF | Option model (*), Forward interest rate, DCF
Carrying value | ₩ 5,540,526 | ₩ 8,476,885
Significant unobservable inputs and range | Discount rate, foreign exchange rate, volatility, stock price and commodity index, etc. | Discount rate, foreign exchange rate, volatility, stock price, commodity index, etc.
Level 2 | Hedging | Derivative liabilities |  |
Valuation techniques and inputs used in measuring the fair value of financial liabilities classified as level 2 & 3 [Line Items] |  |
Carrying value | ₩ 994,626 | ₩ 814,374
Level 3 |  |
Valuation techniques and inputs used in measuring the fair value of financial liabilities classified as level 2 & 3 [Line Items] |  |
Carrying value | 6,282,155 | 7,883,809
Level 3 | Derivative liabilities |  |
Valuation techniques and inputs used in measuring the fair value of financial liabilities classified as level 2 & 3 [Line Items] |  |
Carrying value | ₩ 447,472 | ₩ 744,552
Level 3 | Equity related | Financial liabilities designated at FVTPL |  |
Valuation techniques and inputs used in measuring the fair value of financial liabilities classified as level 2 & 3 [Line Items] |  |
Valuation technique | Option model (*1) | Option model (*1)
Carrying value | ₩ 5,834,683 | ₩ 7,139,257
Significant unobservable inputs and range | The volatility of the underlying asset, Correlations | The volatility of the underlying asset, Correlations
Level 3 | Equity and foreign exchange related | Derivative liabilities |  |
Valuation techniques and inputs used in measuring the fair value of financial liabilities classified as level 2 & 3 [Line Items] |  |
Valuation technique | Option model (*1) | Option model (*1)
Carrying value | ₩ 21,150 | ₩ 181,858
Significant unobservable inputs and range | The volatility of the underlying asset, Correlations | The volatility of the underlying asset, Correlations
Level 3 | Interest rates related | Derivative liabilities |  |
Valuation techniques and inputs used in measuring the fair value of financial liabilities classified as level 2 & 3 [Line Items] |  |
Carrying value | ₩ 335,811 | ₩ 428,049
Significant unobservable inputs and range | The volatility of the underlying asset, Regression coefficient, Correlations | The volatility of the underlying asset, Regression coefficient,Correlations
Level 3 | Credit and commodity related | Derivative liabilities |  |
Valuation techniques and inputs used in measuring the fair value of financial liabilities classified as level 2 & 3 [Line Items] |  |
Carrying value | ₩ 90,511 | ₩ 134,645
Significant unobservable inputs and range | The volatility of the underlying asset, Correlations, Hazard Rate | The volatility of the underlying asset, Correlations, Hazard Rate

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- Definition The description of inputs used in the fair value measurement of liabilities. Inputs are the assumptions that market participants would use when pricing the liability, 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 liabilities. [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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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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