XML 153 R143.htm IDEA: XBRL DOCUMENT
v3.26.1

Borrowings - Summary of Assets Pledges as Collateral (Detail) ₩ in Millions | Dec. 31, 2025 KRW (₩)
--- | ---
Disclosure Of Assets Pledged As Collateral [line items] |
Pledged amount | ₩ 5,754,850
Book value [member] |
Disclosure Of Assets Pledged As Collateral [line items] |
Assets | 5,442,535
Property, plant and equipment including investment property [member] | Korean Development Bank and others [member] |
Disclosure Of Assets Pledged As Collateral [line items] |
Pledged amount | 5,318,147
Property, plant and equipment including investment property [member] | Book value [member] | Korean Development Bank and others [member] |
Disclosure Of Assets Pledged As Collateral [line items] |
Assets | 5,005,832
Trade accounts and notes receivables, net [member] | Korean Development Bank and others [member] |
Disclosure Of Assets Pledged As Collateral [line items] |
Pledged amount | 136,758
Trade accounts and notes receivables, net [member] | Book value [member] | Korean Development Bank and others [member] |
Disclosure Of Assets Pledged As Collateral [line items] |
Assets | 136,758
Financial Instruments [member] | Korean Development Bank and others [member] |
Disclosure Of Assets Pledged As Collateral [line items] |
Pledged amount | 27,314
Financial Instruments [member] | Book value [member] | Korean Development Bank and others [member] |
Disclosure Of Assets Pledged As Collateral [line items] |
Assets | 27,314
Cash equivalents [member] | Shinhan Bank [member] |
Disclosure Of Assets Pledged As Collateral [line items] |
Pledged amount | 272,631
Cash equivalents [member] | Book value [member] | Shinhan Bank [member] |
Disclosure Of Assets Pledged As Collateral [line items] |
Assets | ₩ 272,631

X
- Definition The fair value of collateral held that is permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 15 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_15_a&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_AssetsHeldAsCollateralPermittedToBeSoldOrRepledgedAtFairValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Asset book value. + References No definition available. + Details
Name: | pkx_AssetBookValue
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Disclosure of assets pledged as collateral. + References No definition available. + Details
Name: | pkx_DisclosureOfAssetsPledgedAsCollateralLineItems
Namespace Prefix: | pkx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_FairValueAsDeemedCostAxis=pkx_BookValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=pkx_PropertyPlantAndEquipmentIncludingInvestmentPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=pkx_TradeAccountsAndNotesReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=pkx_FinancialInstrumentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=pkx_CashEquivalentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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