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Derivatives - Nominal values and average hedge ratio for derivatives (Parenthetical) (Details) Unit_pure in Thousands, ₩ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 KRW (₩)
Disclosure of detailed information about hedged items [line items] |  |
Proceeds from exercise of options |  | ₩ 324,027
USD |  |
Disclosure of detailed information about hedged items [line items] |  |
Average foreign exchange rate | 1,307,410 | 1,280,520
JPY |  |
Disclosure of detailed information about hedged items [line items] |  |
Average foreign exchange rate | 9,430 | 9,250
EUR |  |
Disclosure of detailed information about hedged items [line items] |  |
Average foreign exchange rate | 1,487,330 | 1,402,370
GBP |  |
Disclosure of detailed information about hedged items [line items] |  |
Average foreign exchange rate | 1,568,020 | 1,561,570
AUD |  |
Disclosure of detailed information about hedged items [line items] |  |
Average foreign exchange rate | 896,370 | 892,940
CAD |  |
Disclosure of detailed information about hedged items [line items] |  |
Average foreign exchange rate | 999,370 | 991,060
CNY |  |
Disclosure of detailed information about hedged items [line items] |  |
Average foreign exchange rate |  | 189,500
SEK |  |
Disclosure of detailed information about hedged items [line items] |  |
Average foreign exchange rate | 131,640 | 127,540

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- Definition The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_112_c&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The cash inflow from the exercise of options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2025-01-01 -Paragraph 17 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_17&doctype=Standard -URIDate 2025-03-27 + Details
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