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Financial risk management - Classification by categories of financial liabilities (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Classification by categories of financial liabilities [Line Items] |  |
Deposits | ₩ 447,648,971 | ₩ 422,781,045
Financial liabilities at FVTPL | 2,312,487 | 954,899
Financial liabilities designated at FVTPL | 6,378,064 | 8,220,475
Derivatives liabilities | 7,020,846 | 10,058,532
Borrowings | 55,394,834 | 49,920,373
Bonds issued | 92,991,422 | 93,765,854
Investment contract liabilities | 1,536,393 | 1,165,022
Others | 57,890,911 | 39,472,400
Financial liabilities, Total | 671,173,928 | 626,338,600
Financial liabilities at FVTPL |  |
Classification by categories of financial liabilities [Line Items] |  |
Deposits | 0 | 0
Financial liabilities at FVTPL | 2,312,487 | 954,899
Financial liabilities designated at FVTPL | 0 | 0
Derivatives liabilities | 5,872,403 | 9,036,461
Borrowings | 0 | 0
Bonds issued | 0 | 0
Investment contract liabilities | 0 | 0
Others | 0 | 0
Financial liabilities, Total | 8,184,890 | 9,991,360
Financial liabilities designated at FVTPL |  |
Classification by categories of financial liabilities [Line Items] |  |
Deposits | 0 | 0
Financial liabilities at FVTPL | 0 | 0
Financial liabilities designated at FVTPL | 6,378,064 | 8,220,475
Derivatives liabilities | 0 | 0
Borrowings | 0 | 0
Bonds issued | 0 | 0
Investment contract liabilities | 0 | 0
Others | 0 | 0
Financial liabilities, Total | 6,378,064 | 8,220,475
Financial liabilities measured at amortized cost |  |
Classification by categories of financial liabilities [Line Items] |  |
Deposits | 447,648,971 | 422,781,045
Financial liabilities at FVTPL | 0 | 0
Financial liabilities designated at FVTPL | 0 | 0
Derivatives liabilities | 0 | 0
Borrowings | 55,394,834 | 49,920,373
Bonds issued | 92,991,422 | 93,765,854
Investment contract liabilities | 1,536,393 | 1,165,022
Others | 57,890,911 | 39,472,400
Financial liabilities, Total | 655,462,531 | 607,104,694
Derivatives held for hedging |  |
Classification by categories of financial liabilities [Line Items] |  |
Deposits | 0 | 0
Financial liabilities at FVTPL | 0 | 0
Financial liabilities designated at FVTPL | 0 | 0
Derivatives liabilities | 1,148,443 | 1,022,071
Borrowings | 0 | 0
Bonds issued | 0 | 0
Investment contract liabilities | 0 | 0
Others | 0 | 0
Financial liabilities, Total | ₩ 1,148,443 | ₩ 1,022,071

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