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v3.26.1

Events After the Reporting Period - Additional Information (Detail) ₩ / shares in Units, € in Millions, ₩ in Millions, $ in Millions |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 19, 2026 KRW (₩) shares | Feb. 03, 2026 KRW (₩) ₩ / shares | Jan. 16, 2026 USD ($) | Jan. 15, 2026 KRW (₩) | Dec. 31, 2025 KRW (₩) | Dec. 31, 2024 KRW (₩) | Dec. 31, 2024 EUR (€) | Dec. 31, 2023 KRW (₩)
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |
Notional amount | € |  |  |  |  |  |  | € 1,065,900,000 |
Number of treasury shares retired | shares | 1,691,425 |  |  |  |  |  |  |
Cancellation of treasury shares | ₩ 635,100 |  |  |  | ₩ 374,546 | ₩ 431,107 |  |
Treasury shares scheduled retirement date | Mar. 31, 2026 |  |  |  |  |  |  |
Percentage Of Equity Investment |  |  | 100.00% |  |  |  |  |
Investments accounted for using equity method |  |  | $ 582 |  | ₩ 4,980,153 | ₩ 4,738,793 |  | ₩ 5,020,264
Unsecured Bonds Issued [Member] |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |
Notional amount | $ |  |  | 700 |  |  |  |  |
Unsecured Bonds Issued [Member] | 23-1 Unsecured Senior Note One [Member] |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | ₩ 390,000 |  |  |  |
Borrowings, maturity |  |  |  | January 15, 2029 |  |  |  |
Borrowings, interest rate |  |  |  | 3.574% |  |  |  |
Unsecured Bonds Issued [Member] | 23-2 Unsecured Senior Note One [Member] |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |
Notional amount |  |  |  | ₩ 60,000 |  |  |  |
Borrowings, maturity |  |  |  | January 15, 2031 |  |  |  |
Borrowings, interest rate |  |  |  | 3.884% |  |  |  |
Unsecured Bonds Issued [Member] | Unsecured Senior Note One [Member] |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |
Notional amount | $ |  |  | $ 400 |  |  |  |  |
Borrowings, maturity |  |  | January 16, 2031 |  |  |  |  |
Unsecured Bonds Issued [Member] | Unsecured Senior Note Two [Member] |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |
Notional amount | $ |  |  | $ 300 |  |  |  |  |
Borrowings, maturity |  |  | January 16, 2036 |  |  |  |  |
Dividends Paid [Member] |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |
Dividends proposed or declared per share | ₩ / shares |  | ₩ 2,500 |  |  |  |  |  |
Dividends proposed or declared |  | ₩ 189,100 |  |  |  |  |  |
Major business combination [member] | Louisiana Steel LLC [Member] |  |  |  |  |  |  |  |
Disclosure of non-adjusting events after reporting period [line items] |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  | 20.00% |  |  |  |  |

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