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Other Receivables - Finance Lease Receivables (Detail) - Lease receivables [member] - KRW (₩) ₩ in Millions	Dec. 31, 2025	Dec. 31, 2024
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

X

- 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

X

- References

No definition available.

+ Details

Name:	pkx_DisclosureOfLeasesByLessorLineItems
Namespace Prefix:	pkx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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