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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
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