XML 242 R232.htm IDEA: XBRL DOCUMENT
v3.26.1

Commitments and Contingencies - Summary of SOC Projects (Parenthetical) (Detail) - SOC Projects [member] ₩ in Millions | Dec. 31, 2025 KRW (₩)
--- | ---
Funding Obligation [Member] |
Disclosure of contingent liabilities [line items] |
Estimated financial effect of contigent of liabilities | ₩ 1,619,113
Funding Obligation [Member] | Pocheon Hwado Highway Corp [Member] |
Disclosure of contingent liabilities [line items] |
Estimated financial effect of contigent of liabilities | 307,273
Funding Obligation [Member] | POHANG E&E Co., LTD, Pureun Tongyeong Enviro Co., Ltd, Pure Gimpo.Co.,Ltd, and Clean Iksan Co.,Ltd [member] |
Disclosure of contingent liabilities [line items] |
Estimated financial effect of contigent of liabilities | 90,387
Other Shares [Member] |
Disclosure of contingent liabilities [line items] |
Estimated financial effect of contigent of liabilities | 7,702,054
Other Shares [Member] | Pocheon Hwado Highway Corp [Member] |
Disclosure of contingent liabilities [line items] |
Estimated financial effect of contigent of liabilities | 555,848
Other Shares [Member] | POHANG E&E Co., LTD, Pureun Tongyeong Enviro Co., Ltd, Pure Gimpo.Co.,Ltd, and Clean Iksan Co.,Ltd [member] |
Disclosure of contingent liabilities [line items] |
Estimated financial effect of contigent of liabilities | 163,819
POSCO DX Co., Ltd.[member] | Jeonnong Schoo Keeper Co. And Others [Member] | Other related parties [member] |
Disclosure of contingent liabilities [line items] |
Approved Loan Amount Including Other Interests | 1,122,320
Outstanding Balance Of Loan Including Other Interests | ₩ 337,508

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_DisclosureOfContingentLiabilitiesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the estimated financial effect of contingent liabilities. [Refer: Classes of contingent liabilities [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2025-01-01 -Paragraph 86 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2025-en-r&anchor=para_86_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 259 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_259_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 259 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_259_a&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_EstimatedFinancialEffectOfContingentLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Approved loan amount including other interests. + References No definition available. + Details
Name: | pkx_ApprovedLoanAmountIncludingOtherInterests
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Outstanding balance of loan including other interests. + References No definition available. + Details
Name: | pkx_OutstandingBalanceOfLoanIncludingOtherInterests
Namespace Prefix: | pkx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | pkx_TypesOfProjectAxis=pkx_SOCProjectsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfContingentLiabilitiesAxis=pkx_FundingObligationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pkx_ContingentLiabilitiesGuaranteeBeneficiaryAxis=pkx_PocheonhwadoHighwayCorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pkx_ContingentLiabilitiesGuaranteeBeneficiaryAxis=pkx_POHANGEAndECoLtdPureunTongyeongEnviroCoLtdPureGimpoCoLtdAndCleanIksanCoLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfContingentLiabilitiesAxis=pkx_OtherSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pkx_ContingentLiabilitiesGuarantorsAxis=pkx_POSCODXMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | pkx_ContingentLiabilitiesGuaranteeBeneficiaryAxis=pkx_JeonnongSchooKeeperCoAndOthersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=ifrs-full_OtherRelatedPartiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |