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v3.26.1

Commitments and Contingencies - Additional Information (Detail) $ in Thousands, ₩ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2025 KRW (₩) Vessel T shares | Dec. 31, 2025 USD ($) | Dec. 31, 2024 KRW (₩)
Disclosure of contingent liabilities [line items] |  |  |
Borrowings | ₩ | ₩ 28,492,000 |  | ₩ 25,997,367
Credit Commitments [Member] |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Gross loan commitments | ₩ | ₩ 36,127,400 |  |
POSCO HOLDINGS INC [Member] |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Borrowings | $ |  | $ 1,020 |
Posco [member] |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Nickel contracts terms | 1 year |  |
Remaining iron ore to be purchased | 48,000,000 |  |
Remaining coal to be purchased | 18,000,000 |  |
Liquefied natural gas to be purchased | 550,000 |  |
Liquefied natural gas terms | 20 years |  |
Liquefied natural gas revised quantity to be purchased | 120,000 |  |
Number of vessels for transportation of raw materials | Vessel | 32 |  |
Average remaining contract period | 6 years |  |
Percentage of rights and obligations | 59.00% |  |
Liquefied Natural Gas Right To Use | 200,000 |  |
Proportion of voting rights held in joint venture | 59.00% |  |
POSCO FUTURE M CO., LTD. [Member] |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Capital Contributions | $ |  | 484,364 |
Long-term borrowings [member] | POSCO HOLDINGS INC [Member] |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Borrowings | $ |  | $ 1,050 |
Treasury shares [member] | POSCO HOLDINGS INC [Member] |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Treasury shares | shares | 86,611 |  |
POSCO INTERNATIONAL SINGAPORE PTE LTD [member] | Posco [member] |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Liquefied natural gas to be purchased | 370,000 |  |
Liquefied natural gas terms | 15 years |  |
Period of extension of the purchase contract | 5 years |  |
Top of range [member] | Korea National Oil Corporation [member] | Posco [member] |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Iron ore and coal contracts terms | 3 years |  |
Korea Ambatovy Consortium [member] | POSCO INTERNATIONAL CORPORATION [Member] |  |  |
Disclosure of contingent liabilities [line items] |  |  |
Percentage of rights and obligations | 15.33% |  |
Proportion of voting rights held in joint venture | 15.33% |  |

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