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Other Receivables - Finance Lease Receivables (Detail) - Lease receivables [member] - KRW (₩) ₩ in Millions | Dec. 31, 2025 | Dec. 31, 2024
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Disclosure of finance lease and operating lease by lessor [line items] |  |
Undiscounted finance lease payments to be received | ₩ 80,108 | ₩ 94,904
Pohang University of Science and Technology [member] |  |
Disclosure of finance lease and operating lease by lessor [line items] |  |
Undiscounted finance lease payments to be received | 7,267 | 7,429
Korea Business Angels Association [member] |  |
Disclosure of finance lease and operating lease by lessor [line items] |  |
Undiscounted finance lease payments to be received | 1,562 | 2,162
HEUNG-A SHIPPING CO., LTD. |  |
Disclosure of finance lease and operating lease by lessor [line items] |  |
Undiscounted finance lease payments to be received | 43,558 | 45,179
Executive Offshore, PT Wintermar, COHC, Myanma Port Authority [member] |  |
Disclosure of finance lease and operating lease by lessor [line items] |  |
Undiscounted finance lease payments to be received | ₩ 27,721 | ₩ 40,134

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- Definition The amount of undiscounted finance lease payments to be received. Finance lease is a lease that transfers substantially all the risks and rewards incidental to ownership of an underlying asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2025-01-01 -Paragraph 94 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2025-en-r&anchor=para_94&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 122 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_122_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 122 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_122_a&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_UndiscountedFinanceLeasePaymentsToBeReceived
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | pkx_DisclosureOfLeasesByLessorLineItems
Namespace Prefix: | pkx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_LeaseReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MajorCustomersAxis=pkx_PohangUniversityOfScienceAndTechnologyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MajorCustomersAxis=pkx_KoreaBusinessAngelsAssociationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MajorCustomersAxis=pkx_HEUNGASHIPPINGCOLTDMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_MajorCustomersAxis=pkx_ExecutiveOffshorePtWintermarCohcMyanmaPortAuthorityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |