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Defined benefit plans -Summary of sensitivity analysis for actuarial assumptions (Details) (Parenthetical) - KRW (₩) ₩ in Millions | Dec. 31, 2026 | Dec. 31, 2025 | Dec. 31, 2024
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Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Defined benefit plan expected future benefit payments Year 2026 | ₩ 161,400 |  |
Actuarial assumption of discount rates [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Percentage of reasonably possible increase in actuarial assumption |  | 1.00% | 1.00%
Actuarial assumption of expected rates of salary increases [member] |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Percentage of reasonably possible decrease in actuarial assumption |  | 1.00% | 1.00%

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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 No definition available. + Details
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- Definition The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [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 reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [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 Defined benefit plan expected future benefit payment next twelve months. + References No definition available. + Details
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