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Commitments and Contingencies - Summary of amount for the acquisition of major assets (Detail) - KRW (₩) ₩ in Millions	Dec. 31, 2025	Dec. 31, 2024
Disclosure of contingent liabilities [abstract]
Property, Plant and Equipment	₩ 5,573,047	₩ 5,853,808
Intangible Assets	42,124	27,859
Investments in associates and joint ventures	167,683	92,958
Commitment for asset acquisition	₩ 5,782,854	₩ 5,974,625

X

- Definition

The amount of contractual commitments for the acquisition of intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2025-01-01
-Paragraph 122
-Subparagraph e
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-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 264
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_264_e&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
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-IssueDate 2025-01-01
-Paragraph 264
-Subparagraph e
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-URIDate 2025-03-27

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Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of contractual commitments for the acquisition of property, plant and equipment. [Refer: Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2025-01-01
-Paragraph 74
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2025-en-r&anchor=para_74_c&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
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-IssueDate 2025-01-01
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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- References

No definition available.

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- Definition

Commitment for acquisition of investments in associates and joint ventures.

+ References

No definition available.

+ Details

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X

- Definition

Commitment for asset acquisition.

+ References

No definition available.

+ Details

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Namespace Prefix:	pkx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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