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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents - Additional Information (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2025	Dec. 31, 2024
Disclosure of Cash and Cash Equivalents [Line Items]
Value of cash and cash equivalents	₩ 339,064	₩ 46,650

X

- Definition

The amount of current restricted cash and cash equivalents. [Refer: Restricted cash and cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&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

X

- Definition

Disclosure of cash and cash equivalents.

+ References

No definition available.

+ Details

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