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Defined benefit plans - Summary of sensitivity analysis for actuarial assumptions (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2025	Dec. 31, 2024
Discount rate
Sensitivity analysis for actuarial assumptions [Line Items]
Increase	₩ (183,183)	₩ (180,402)
Decrease	199,684	204,053
Future salary increase rate
Sensitivity analysis for actuarial assumptions [Line Items]
Increase	202,468	211,736
Decrease	₩ (191,712)	₩ (190,347)

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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

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

+ References

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

+ References

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