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Trade Accounts and Notes Receivable - Additional Information (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2025	Dec. 31, 2024
Trade accounts and notes receivables, net [member]
Disclosure of financial assets [line items]
Trade accounts and notes receivable sold to financial institutions, for which the derecognition conditions were not met	₩ 136,758	₩ 119,076

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

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

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- Definition

The fair value of transferred financial assets that are not derecognised in their entirety. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 42D
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_42D_d&doctype=Standard
-URIDate 2025-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

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