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Defined benefit plans - Summary of sensitivity analysis for actuarial assumptions (Details) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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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 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_145_a&doctype=Standard -URIDate 2025-03-27 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_145_a&doctype=Standard -URIDate 2025-03-27 + Details
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