XML 120 R110.htm IDEA: XBRL DOCUMENT
v3.26.1

Other Financial Assets - Summary of Other Financial Assets (Parenthetical) (Detail) - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Financial arrangements, pledge and others [member] |  |
Disclosure of financial assets [line items] |  |
Financial instruments restricted for use | ₩ 362,150 | ₩ 386,816
Available-for-sale financial assets [member] |  |
Disclosure of financial assets [line items] |  |
Available-for-sale securities, respectively, have been provided as collateral for borrowings, construction projects and others | ₩ 122,285 | ₩ 182,862

X
- Definition The amount in the consolidated financial statements of the assets of the group to which significant restrictions (for example, statutory, contractual and regulatory restrictions) apply on the entity's ability to access or use the assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2025-01-01 -Paragraph 13 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2025-en-r&anchor=para_13_c&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_AssetsToWhichSignificantRestrictionsApply
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | ifrs-full_DisclosureOfFinancialAssetsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Classes of contingent liabilities [domain]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 14 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_14_a&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 51 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_51_a&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 51 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_51_a&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_FinancialAssetsPledgedAsCollateralForLiabilitiesOrContingentLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_CounterpartiesAxis=pkx_FinancialArrangementsPledgeAndOthersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_FinancialAssetsAvailableforsaleCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |