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Financial risk management - Sensitivity analysis for fair value measurements in Level 3 (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Financial assets |  |
Sensitivity analysis for fair value measurements in Level 3 [Line Items] |  |
Favorable Changes - Financial Assets | ₩ 111,039 | ₩ 127,784
Unfavorable Changes - Financial Assets | (92,413) | (97,419)
Financial liabilities |  |
Sensitivity analysis for fair value measurements in Level 3 [Line Items] |  |
Favorable Changes - Financial Liabilities | 21,574 | 45,202
Unfavorable Changes - Financial Liabilities | (22,302) | (42,294)
Effects on profit or loss for the period | Financial asset at FVTPL |  |
Sensitivity analysis for fair value measurements in Level 3 [Line Items] |  |
Favorable Changes - Financial Assets | 35,062 | 38,489
Unfavorable Changes - Financial Assets | (34,827) | (33,351)
Effects on profit or loss for the period | Derivative assets |  |
Sensitivity analysis for fair value measurements in Level 3 [Line Items] |  |
Favorable Changes - Financial Assets | 15,446 | 14,813
Unfavorable Changes - Financial Assets | (14,723) | (14,777)
Effects on profit or loss for the period | Financial liabilities designated at FVTPL |  |
Sensitivity analysis for fair value measurements in Level 3 [Line Items] |  |
Favorable Changes - Financial Liabilities | 14,685 | 19,782
Unfavorable Changes - Financial Liabilities | (14,764) | (20,339)
Effects on profit or loss for the period | Derivative liabilities |  |
Sensitivity analysis for fair value measurements in Level 3 [Line Items] |  |
Favorable Changes - Financial Liabilities | 6,889 | 25,420
Unfavorable Changes - Financial Liabilities | (7,538) | (21,955)
Securities at fair value through other comprehensive income | Financial assets at FVOCI |  |
Sensitivity analysis for fair value measurements in Level 3 [Line Items] |  |
Favorable Changes - Financial Assets | 60,531 | 74,482
Unfavorable Changes - Financial Assets | ₩ (42,863) | ₩ (49,291)

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