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Financial risk management - Fair Value measurement of financial liabilities measured at fair value (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | ₩ 15,711,397 | ₩ 19,233,906
Financial liabilities at FVTPL |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 2,312,487 | 954,899
Financial liabilities at FVTPL | Securities sold |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 790,416 | 357,841
Financial liabilities at FVTPL | Gold/silver deposits |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 1,522,071 | 597,058
Financial liabilities designated at FVTPL |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 6,378,064 | 8,220,475
Financial liabilities designated at FVTPL | Derivatives-combined securities |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 6,090,215 | 7,959,176
Financial liabilities designated at FVTPL | Debt securities issued |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 287,849 | 261,299
Derivative liabilities |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 7,020,846 | 10,058,532
Derivative liabilities | Trading |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 5,872,403 | 9,036,461
Derivative liabilities | Hedging |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 1,148,443 | 1,022,071
Level 1 |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 2,350,709 | 977,620
Level 1 | Financial liabilities at FVTPL |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 2,312,487 | 954,899
Level 1 | Financial liabilities at FVTPL | Securities sold |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 790,416 | 357,841
Level 1 | Financial liabilities at FVTPL | Gold/silver deposits |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 1,522,071 | 597,058
Level 1 | Derivative liabilities |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 38,222 | 22,721
Level 1 | Derivative liabilities | Trading |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 38,222 | 22,721
Level 2 |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 7,078,533 | 10,372,477
Level 2 | Financial liabilities designated at FVTPL |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 543,381 | 1,081,218
Level 2 | Financial liabilities designated at FVTPL | Derivatives-combined securities |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 255,532 | 819,919
Level 2 | Financial liabilities designated at FVTPL | Debt securities issued |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 287,849 | 261,299
Level 2 | Derivative liabilities |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 6,535,152 | 9,291,259
Level 2 | Derivative liabilities | Trading |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 5,540,526 | 8,476,885
Level 2 | Derivative liabilities | Hedging |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 994,626 | 814,374
Level 3 |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 6,282,155 | 7,883,809
Level 3 | Financial liabilities designated at FVTPL |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 5,834,683 | 7,139,257
Level 3 | Financial liabilities designated at FVTPL | Derivatives-combined securities |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 5,834,683 | 7,139,257
Level 3 | Derivative liabilities |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 447,472 | 744,552
Level 3 | Derivative liabilities | Trading |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | 293,655 | 536,855
Level 3 | Derivative liabilities | Hedging |  |
Fair Value measurement of financial liabilities measured at fair value [Line Items] |  |
Carrying value | ₩ 153,817 | ₩ 207,697

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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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- Definition The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 25 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_25&doctype=Standard -URIDate 2025-03-27 + Details
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