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Hybrid Bonds - Summary of Hybrid Bonds (Parenthetical) (Detail) - Hybrid bond 1-2 [member] - KRW (₩) ₩ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024
Disclosure of detailed information about borrowings [line items] |  |
Maturity date | 30 years (The issuer has a right to extend the maturity date) |
Interest rate | 4.64% | 4.64%
Interest payments condition | Quarterly (The issuer may defer interest payments except in cases where it resolves to pay dividends or repays pari passu debt and subordinated debt) |
Others | The issuer can call the hybrid bond 5 years of after issuance |
POSCO HOLDINGS INC [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Hybrid Bonds Classified As Equity Acquired | ₩ 500,000 |
Hybrid Bonds Classified As Equity | ₩ 600,000 |
Every Year [Member] |  |
Disclosure of detailed information about borrowings [line items] |  |
Interest rate adjustment | 0.75% |

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- Definition The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_7&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_7&doctype=Standard -URIDate 2025-03-27 + Details
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- Details
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- Details
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- Details
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